{
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          "standard_track": true,
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        }
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CSSKeyframesRule/appendRule",
          "spec_url": "https://drafts.csswg.org/css-animations/#interface-csskeyframesrule-appendrule",
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              },
              {
                "alternative_name": "insertRule",
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              }
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            },
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              },
              {
                "alternative_name": "insertRule",
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            },
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                "alternative_name": "insertRule",
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              }
            ],
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            "webview_android": "mirror"
          },
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            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CSSKeyframesRule/cssRules",
          "spec_url": "https://drafts.csswg.org/css-animations/#dom-csskeyframesrule-cssrules",
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            },
            "chrome_android": "mirror",
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            },
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          },
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            "standard_track": true,
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            },
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          },
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            "standard_track": true,
            "deprecated": false
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      },
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CSSKeyframesRule/findRule",
          "spec_url": "https://drafts.csswg.org/css-animations/#interface-csskeyframesrule-findrule",
          "support": {
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              "version_added": "1"
            },
            "chrome_android": "mirror",
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            },
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            "webview_android": "mirror"
          },
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            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
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        "__compat": {
          "spec_url": "https://drafts.csswg.org/css-animations/#dom-csskeyframesrule-length",
          "support": {
            "chrome": {
              "version_added": false,
              "impl_url": "https://crbug.com/1502758"
            },
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            "edge": "mirror",
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            },
            "firefox_android": "mirror",
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            },
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            "webview_android": "mirror"
          },
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            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/CSSKeyframesRule/name",
          "spec_url": "https://drafts.csswg.org/css-animations/#dom-csskeyframesrule-name",
          "support": {
            "chrome": {
              "version_added": "1"
            },
            "chrome_android": "mirror",
            "edge": {
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            },
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            },
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            },
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            },
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            },
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            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror"
          },
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            "experimental": false,
            "standard_track": true,
            "deprecated": false
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        }
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    }
  }
}