{
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          },
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        }
      },
      "SyncEvent": {
        "__compat": {
          "description": "`SyncEvent()` constructor",
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/SyncEvent/SyncEvent",
          "spec_url": "https://wicg.github.io/background-sync/spec/#dom-syncevent-syncevent",
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            },
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            "opera": "mirror",
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            "safari": {
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            },
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            },
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          },
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          }
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/SyncEvent/lastChance",
          "spec_url": "https://wicg.github.io/background-sync/spec/#ref-for-dom-syncevent-lastchance③",
          "tags": [
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          ],
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            },
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            },
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            },
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            "opera_android": "mirror",
            "safari": {
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            },
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          },
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            "standard_track": true,
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          }
        }
      },
      "tag": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/SyncEvent/tag",
          "spec_url": "https://wicg.github.io/background-sync/spec/#ref-for-dom-syncevent-tag",
          "tags": [
            "web-features:background-sync"
          ],
          "support": {
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            },
            "chrome_android": "mirror",
            "edge": "mirror",
            "firefox": {
              "version_added": false
            },
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            "ie": {
              "version_added": false
            },
            "oculus": "mirror",
            "opera": "mirror",
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            "safari": {
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            },
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            },
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}