{
  "api": {
    "Performance": {
      "__compat": {
        "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance",
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        ],
        "tags": [
          "web-features:performance"
        ],
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          },
          "chrome_android": "mirror",
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            {
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              "notes": "Only available as an internal instance."
            }
          ],
          "oculus": "mirror",
          "opera": "mirror",
          "opera_android": "mirror",
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            "version_added": "8"
          },
          "safari_ios": {
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          },
          "webview_ios": "mirror"
        },
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          "deprecated": false
        }
      },
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        "__compat": {
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          "spec_url": "https://w3c.github.io/user-timing/#dom-performance-clearmarks",
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          ],
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              },
              {
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            "webview_ios": "mirror"
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            "standard_track": true,
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          }
        }
      },
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          "support": {
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              {
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            },
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            "webview_ios": "mirror"
          },
          "status": {
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            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "clearResourceTimings": {
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          "tags": [
            "web-features:performance"
          ],
          "support": {
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              {
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              },
              {
                "prefix": "webkit",
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                "version_removed": "57"
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              "version_added": false
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              {
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            ],
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            "opera": "mirror",
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            "samsunginternet_android": "mirror",
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            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "eventCounts": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance/eventCounts",
          "spec_url": "https://w3c.github.io/event-timing/#dom-performance-eventcounts",
          "tags": [
            "web-features:event-timing"
          ],
          "support": {
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              "version_added": "85"
            },
            "chrome_android": "mirror",
            "deno": {
              "version_added": false
            },
            "edge": "mirror",
            "firefox": {
              "version_added": "89"
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            "firefox_android": "mirror",
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              "version_added": false
            },
            "nodejs": {
              "version_added": false
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": false
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "getEntries": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance/getEntries",
          "spec_url": "https://w3c.github.io/performance-timeline/#dom-performance-getentries",
          "tags": [
            "web-features:performance"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "28"
              },
              {
                "prefix": "webkit",
                "version_added": "25",
                "version_removed": "36"
              }
            ],
            "chrome_android": "mirror",
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            },
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            },
            "firefox": {
              "version_added": "35"
            },
            "firefox_android": "mirror",
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            "nodejs": {
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            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
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            },
            "safari_ios": "mirror",
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            "webview_android": {
              "version_added": "4.4"
            },
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "getEntriesByName": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance/getEntriesByName",
          "spec_url": "https://w3c.github.io/performance-timeline/#dom-performance-getentriesbyname",
          "tags": [
            "web-features:performance"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "28"
              },
              {
                "prefix": "webkit",
                "version_added": "25",
                "version_removed": "36"
              }
            ],
            "chrome_android": "mirror",
            "deno": {
              "version_added": "1.2"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "35"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "10"
            },
            "nodejs": {
              "version_added": "16.7.0"
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
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            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": {
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            },
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "getEntriesByType": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance/getEntriesByType",
          "spec_url": "https://w3c.github.io/performance-timeline/#dom-performance-getentriesbytype",
          "tags": [
            "web-features:performance"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "28"
              },
              {
                "prefix": "webkit",
                "version_added": "25",
                "version_removed": "36"
              }
            ],
            "chrome_android": "mirror",
            "deno": {
              "version_added": "1.2"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "35"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "10"
            },
            "nodejs": {
              "version_added": "16.7.0"
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "11"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": {
              "version_added": "4.4"
            },
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "mark": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance/mark",
          "spec_url": "https://w3c.github.io/user-timing/#dom-performance-mark",
          "tags": [
            "web-features:performance"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "28"
              },
              {
                "prefix": "webkit",
                "version_added": "25",
                "version_removed": "28"
              }
            ],
            "chrome_android": "mirror",
            "deno": {
              "version_added": "1.2"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "38"
            },
            "firefox_android": {
              "version_added": "42"
            },
            "ie": {
              "version_added": "10"
            },
            "nodejs": {
              "version_added": "8.5.0"
            },
            "oculus": "mirror",
            "opera": {
              "version_added": "33"
            },
            "opera_android": {
              "version_added": "33"
            },
            "safari": {
              "version_added": "11"
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": false
          }
        },
        "markOptions_parameter": {
          "__compat": {
            "description": "`markOptions` parameter",
            "tags": [
              "web-features:performance"
            ],
            "support": {
              "chrome": {
                "version_added": "78"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.2"
              },
              "edge": "mirror",
              "firefox": {
                "version_added": "101"
              },
              "firefox_android": "mirror",
              "ie": {
                "version_added": false
              },
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                "version_added": "16.0.0"
              },
              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
                "version_added": "14.1"
              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "returns_performancemark": {
          "__compat": {
            "description": "Returns `PerformanceMark`",
            "tags": [
              "web-features:performance"
            ],
            "support": {
              "chrome": {
                "version_added": "78"
              },
              "chrome_android": "mirror",
              "deno": {
                "version_added": "1.2"
              },
              "edge": "mirror",
              "firefox": {
                "version_added": "101"
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                "version_added": false
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              "opera": "mirror",
              "opera_android": "mirror",
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            "status": {
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              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "measure": {
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          "spec_url": "https://w3c.github.io/user-timing/#dom-performance-measure",
          "tags": [
            "web-features:performance"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "28"
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              {
                "prefix": "webkit",
                "version_added": "25",
                "version_removed": "28"
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        },
        "measureOptions_parameter": {
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            "tags": [
              "web-features:performance"
            ],
            "support": {
              "chrome": {
                "version_added": "77"
              },
              "chrome_android": "mirror",
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                "version_added": "1.2"
              },
              "edge": "mirror",
              "firefox": {
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              "ie": {
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              "oculus": "mirror",
              "opera": "mirror",
              "opera_android": "mirror",
              "safari": {
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              },
              "safari_ios": "mirror",
              "samsunginternet_android": "mirror",
              "webview_android": "mirror",
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            },
            "status": {
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              "standard_track": true,
              "deprecated": false
            }
          }
        },
        "returns_performancemeasure": {
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            "tags": [
              "web-features:performance"
            ],
            "support": {
              "chrome": {
                "version_added": "78"
              },
              "chrome_android": "mirror",
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              },
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              "samsunginternet_android": "mirror",
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              "webview_ios": "mirror"
            },
            "status": {
              "experimental": false,
              "standard_track": true,
              "deprecated": false
            }
          }
        }
      },
      "measureUserAgentSpecificMemory": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance/measureUserAgentSpecificMemory",
          "spec_url": "https://wicg.github.io/performance-measure-memory/#ref-for-dom-performance-measureuseragentspecificmemory⑤",
          "tags": [
            "web-features:measure-memory"
          ],
          "support": {
            "chrome": {
              "version_added": "89"
            },
            "chrome_android": "mirror",
            "deno": {
              "version_added": false
            },
            "edge": "mirror",
            "firefox": {
              "version_added": false
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": false
            },
            "nodejs": {
              "version_added": false
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": false
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": "mirror",
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": true,
            "standard_track": true,
            "deprecated": false
          }
        }
      },
      "memory": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance/memory",
          "support": {
            "chrome": {
              "version_added": "7"
            },
            "chrome_android": "mirror",
            "deno": {
              "version_added": false
            },
            "edge": "mirror",
            "firefox": {
              "version_added": false
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": false
            },
            "nodejs": {
              "version_added": false
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": false
            },
            "safari_ios": "mirror",
            "samsunginternet_android": "mirror",
            "webview_android": {
              "version_added": "≤37"
            },
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": false,
            "deprecated": true
          }
        }
      },
      "navigation": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance/navigation",
          "spec_url": "https://w3c.github.io/navigation-timing/#dom-performance-navigation",
          "support": {
            "chrome": {
              "version_added": "10"
            },
            "chrome_android": "mirror",
            "deno": {
              "version_added": false
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "7"
            },
            "firefox_android": "mirror",
            "ie": {
              "version_added": "9"
            },
            "nodejs": {
              "version_added": false
            },
            "oculus": "mirror",
            "opera": "mirror",
            "opera_android": "mirror",
            "safari": {
              "version_added": "8"
            },
            "safari_ios": {
              "version_added": "9"
            },
            "samsunginternet_android": "mirror",
            "webview_android": {
              "version_added": "≤37"
            },
            "webview_ios": "mirror"
          },
          "status": {
            "experimental": false,
            "standard_track": true,
            "deprecated": true
          }
        }
      },
      "now": {
        "__compat": {
          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Performance/now",
          "spec_url": "https://w3c.github.io/hr-time/#dom-performance-now",
          "tags": [
            "web-features:performance"
          ],
          "support": {
            "chrome": [
              {
                "version_added": "24"
              },
              {
                "prefix": "webkit",
                "version_added": "21",
                "version_removed": "24"
              }
            ],
            "chrome_android": "mirror",
            "deno": {
              "version_added": "1.0"
            },
            "edge": {
              "version_added": "12"
            },
            "firefox": {
              "version_added": "15",
              "notes": [
                "In Firefox 57.0.4 the accuracy was reduced to 20 microseconds.",
                "In Firefox 59 the accuracy was reduced to 2 milliseconds.",
                "In Firefox 60 the accuracy was increased to 1 millisecond."
              ]
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