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            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
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            "experimental": false,
            "standard_track": true,
            "deprecated": true
          }
        }
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        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/PerformanceTiming/unloadEventEnd",
          "spec_url": "https://w3c.github.io/navigation-timing/#dom-performancetiming-unloadeventend",
          "support": {
            "chrome": {
              "version_added": "6"
            },
            "chrome_android": "mirror",
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "7"
            },
            "firefox_android": "mirror",
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              "version_added": "9"
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
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              "version_added": "8"
            },
            "safari_ios": {
              "version_added": "9"
            },
            "samsunginternet_android": "mirror",
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              "version_added": "≤37"
            },
            "webview_ios": "mirror"
          },
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            "experimental": false,
            "standard_track": true,
            "deprecated": true
          }
        }
      },
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          "mdn_url": "https://developer.mozilla.org/docs/Web/API/PerformanceTiming/unloadEventStart",
          "spec_url": "https://w3c.github.io/navigation-timing/#dom-performancetiming-unloadeventstart",
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            },
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              "version_added": "12"
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            },
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            },
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            "opera": "mirror",
            "opera_android": "mirror",
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            },
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              "version_added": "9"
            },
            "samsunginternet_android": "mirror",
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              "version_added": "≤37"
            },
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": true
          }
        }
      }
    }
  }
}