{
  "css": {
    "properties": {
      "position-area": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/Reference/Properties/position-area",
          "spec_url": "https://drafts.csswg.org/css-anchor-position/#position-area",
          "tags": [
            "web-features:anchor-positioning"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "129",
                "notes": "The `position-area` property changes the position of absolutely positioned elements that do not find an anchor. See [bug 388575663](https://crbug.com/388575663)."
              },
              {
                "alternative_name": "inset-area",
                "version_added": "125",
                "version_removed": "131"
              }
            ],
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": "147"
            },
            "firefox_android": "mirror",
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "26"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "block-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-block-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `block-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `block-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "block-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-block-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `block-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `block-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "bottom": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-bottom",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `bottom` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `bottom` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "center": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-center",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "disables_auto_margins_and_insets": {
          "__compat": {
            "description": "`position-area` resolves `margin: auto` and `inset: auto` to 0",
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#:~:text=available%0Afor%20positioning.-,the%20used%20value%20of%20any%20auto%20inset%20properties%20and%20auto%20margin%20properties%20resolves%20to%200.,-The%20normal%20value",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "143"
                },
                {
                  "version_added": "125",
                  "version_removed": "130"
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "148"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26.2"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "inline-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-inline-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `inline-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `inline-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "inline-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-inline-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `inline-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `inline-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "left": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-left",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `left` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `left` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "none": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-none",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "right": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-right",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `right` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `right` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-block-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-block-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-block-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-block-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-block-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-block-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-block-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-block-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-inline-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-inline-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-inline-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-inline-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-inline-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-inline-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-inline-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-inline-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-x-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-x-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "143",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-x-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                },
                {
                  "alternative_name": "x-self-end",
                  "version_added": "129",
                  "version_removed": "143",
                  "partial_implementation": true,
                  "notes": "When `x-self-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-x-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": [
                {
                  "version_added": "26.2"
                },
                {
                  "alternative_name": "x-self-end",
                  "version_added": "26"
                }
              ],
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-x-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-x-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "143",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-x-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                },
                {
                  "alternative_name": "x-self-start",
                  "version_added": "129",
                  "version_removed": "143",
                  "partial_implementation": true,
                  "notes": "When `x-self-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-x-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": [
                {
                  "version_added": "26.2"
                },
                {
                  "alternative_name": "x-self-start",
                  "version_added": "26"
                }
              ],
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-y-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-y-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "143",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-y-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                },
                {
                  "alternative_name": "y-self-end",
                  "version_added": "129",
                  "version_removed": "143",
                  "partial_implementation": true,
                  "notes": "When `y-self-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-y-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": [
                {
                  "version_added": "26.2"
                },
                {
                  "alternative_name": "y-self-end",
                  "version_added": "26"
                }
              ],
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "self-y-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-self-y-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "143",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `self-y-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                },
                {
                  "alternative_name": "y-self-start",
                  "version_added": "129",
                  "version_removed": "143",
                  "partial_implementation": true,
                  "notes": "When `y-self-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `self-y-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": [
                {
                  "version_added": "26.2"
                },
                {
                  "alternative_name": "y-self-start",
                  "version_added": "26"
                }
              ],
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-all": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-all",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "Using `span-all` unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147",
                "partial_implementation": true,
                "notes": "Using `span-all` unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-block-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-block-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-block-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-block-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-bottom": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-bottom",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-inline-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-inline-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-inline-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-inline-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-left": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-left",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-right": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-right",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-block-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-block-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-block-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-block-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-inline-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-inline-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-inline-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-inline-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-x-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-x-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "143"
                },
                {
                  "alternative_name": "span-x-self-end",
                  "version_added": "129",
                  "version_removed": "143"
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": [
                {
                  "version_added": "26.2"
                },
                {
                  "alternative_name": "span-x-self-end",
                  "version_added": "26"
                }
              ],
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-x-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-x-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "143"
                },
                {
                  "alternative_name": "span-x-self-start",
                  "version_added": "129",
                  "version_removed": "143"
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": [
                {
                  "version_added": "26.2"
                },
                {
                  "alternative_name": "span-x-self-start",
                  "version_added": "26"
                }
              ],
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-y-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-y-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "143"
                },
                {
                  "alternative_name": "span-y-self-end",
                  "version_added": "129",
                  "version_removed": "143"
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": [
                {
                  "version_added": "26.2"
                },
                {
                  "alternative_name": "span-y-self-end",
                  "version_added": "26"
                }
              ],
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-self-y-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-self-y-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "143"
                },
                {
                  "alternative_name": "span-y-self-start",
                  "version_added": "129",
                  "version_removed": "143"
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": [
                {
                  "version_added": "26.2"
                },
                {
                  "alternative_name": "span-y-self-start",
                  "version_added": "26"
                }
              ],
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-top": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-top",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-x-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-x-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-x-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-x-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-y-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-y-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "span-y-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-span-y-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": {
                "version_added": "129"
              },
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": {
                "version_added": "147"
              },
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "top": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-top",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `top` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `top` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "x-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-x-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `x-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `x-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "x-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-x-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `x-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `x-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "y-end": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-y-end",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `y-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `y-end` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "y-start": {
          "__compat": {
            "spec_url": "https://drafts.csswg.org/css-anchor-position/#valdef-position-area-y-start",
            "tags": [
              "web-features:anchor-positioning"
            ],
            "support": {
              "chrome": [
                {
                  "version_added": "144"
                },
                {
                  "version_added": "129",
                  "version_removed": "144",
                  "partial_implementation": true,
                  "notes": "When `y-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 438334710](https://crbug.com/438334710)."
                }
              ],
              "chrome_android": "mirror",
              "edge": "mirror",
              "firefox": [
                {
                  "version_added": "148"
                },
                {
                  "version_added": "147",
                  "version_removed": "148",
                  "partial_implementation": true,
                  "notes": "When `y-start` is used as a single keyword, or alongside `span-all`, it unexpectedly allows the anchored box to overflow the viewport, obscuring content. Use `place-self: anchor-center` as a workaround. See [bug 2008537](https://bugzil.la/2008537)."
                }
              ],
              "firefox_android": "mirror",
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "26"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      }
    }
  }
}