{
    "dom-performance-now": [
        {
            "engines": [
                "blink",
                "gecko",
                "webkit"
            ],
            "filename": "api/Performance.json",
            "name": "now",
            "slug": "API/Performance/now",
            "mdn_url": "https://developer.mozilla.org/en-US/docs/Web/API/Performance/now",
            "summary": "The performance.now() method returns a high resolution timestamp in milliseconds. It represents the time elapsed since Performance.timeOrigin (the time when navigation has started in window contexts, or the time when the worker is run in Worker and ServiceWorker contexts).",
            "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."
                    ]
                },
                "firefox_android": "mirror",
                "ie": {
                    "version_added": "10"
                },
                "nodejs": {
                    "version_added": "8.5.0"
                },
                "oculus": "mirror",
                "opera": "mirror",
                "opera_android": "mirror",
                "safari": {
                    "version_added": "8"
                },
                "safari_ios": {
                    "version_added": "9"
                },
                "samsunginternet_android": "mirror",
                "webview_android": "mirror",
                "edge_blink": [
                    {
                        "version_added": "79"
                    },
                    {
                        "prefix": "webkit",
                        "version_added": false,
                        "version_removed": "24"
                    }
                ]
            },
            "title": "Performance: now() method"
        }
    ],
    "dom-performance-timeorigin": [
        {
            "engines": [
                "blink",
                "gecko",
                "webkit"
            ],
            "filename": "api/Performance.json",
            "name": "timeOrigin",
            "slug": "API/Performance/timeOrigin",
            "mdn_url": "https://developer.mozilla.org/en-US/docs/Web/API/Performance/timeOrigin",
            "summary": "The timeOrigin read-only property of the Performance interface returns the high resolution timestamp that is used as the baseline for performance-related timestamps.",
            "support": {
                "chrome": {
                    "version_added": "62"
                },
                "chrome_android": "mirror",
                "deno": {
                    "version_added": "1.22"
                },
                "edge": {
                    "version_added": "16"
                },
                "firefox": {
                    "version_added": "53"
                },
                "firefox_android": "mirror",
                "ie": {
                    "version_added": false
                },
                "nodejs": {
                    "version_added": "8.5.0"
                },
                "oculus": "mirror",
                "opera": "mirror",
                "opera_android": "mirror",
                "safari": {
                    "version_added": "15"
                },
                "safari_ios": "mirror",
                "samsunginternet_android": "mirror",
                "webview_android": "mirror",
                "edge_blink": {
                    "version_added": "79"
                }
            },
            "title": "Performance: timeOrigin property"
        }
    ],
    "dom-performance-tojson": [
        {
            "engines": [
                "blink",
                "gecko",
                "webkit"
            ],
            "filename": "api/Performance.json",
            "name": "toJSON",
            "slug": "API/Performance/toJSON",
            "mdn_url": "https://developer.mozilla.org/en-US/docs/Web/API/Performance/toJSON",
            "summary": "The toJSON() method of the Performance interface is a serializer; it returns a JSON representation of the Performance object.",
            "support": {
                "chrome": {
                    "version_added": "56"
                },
                "chrome_android": "mirror",
                "deno": {
                    "version_added": "1.22"
                },
                "edge": {
                    "version_added": "12"
                },
                "firefox": {
                    "version_added": "25"
                },
                "firefox_android": "mirror",
                "ie": {
                    "version_added": "9"
                },
                "nodejs": {
                    "version_added": "16.1.0"
                },
                "oculus": "mirror",
                "opera": {
                    "version_added": false
                },
                "opera_android": {
                    "version_added": false
                },
                "safari": {
                    "version_added": "14.1"
                },
                "safari_ios": "mirror",
                "samsunginternet_android": "mirror",
                "webview_android": "mirror",
                "edge_blink": {
                    "version_added": "79"
                }
            },
            "title": "Performance: toJSON() method"
        }
    ],
    "sec-performance": [
        {
            "engines": [
                "blink",
                "gecko",
                "webkit"
            ],
            "filename": "api/Performance.json",
            "name": "Performance",
            "slug": "API/Performance",
            "mdn_url": "https://developer.mozilla.org/en-US/docs/Web/API/Performance",
            "summary": "The Performance interface provides access to performance-related information for the current page.",
            "support": {
                "chrome": {
                    "version_added": "6"
                },
                "chrome_android": "mirror",
                "deno": {
                    "version_added": "1.0"
                },
                "edge": {
                    "version_added": "12"
                },
                "firefox": {
                    "version_added": "7"
                },
                "firefox_android": "mirror",
                "ie": {
                    "version_added": "9"
                },
                "nodejs": {
                    "version_added": "8.5.0",
                    "notes": "Exported from the <code>perf_hooks</code> module",
                    "partial_implementation": true
                },
                "oculus": "mirror",
                "opera": "mirror",
                "opera_android": "mirror",
                "safari": {
                    "version_added": "8"
                },
                "safari_ios": {
                    "version_added": "9"
                },
                "samsunginternet_android": "mirror",
                "webview_android": {
                    "version_added": "37"
                },
                "edge_blink": {
                    "version_added": "79"
                }
            },
            "title": "Performance"
        }
    ],
    "the-performance-attribute": [
        {
            "engines": [
                "blink",
                "gecko",
                "webkit"
            ],
            "filename": "api/_globals/performance.json",
            "name": "performance",
            "slug": "API/performance_property",
            "mdn_url": "https://developer.mozilla.org/en-US/docs/Web/API/performance_property",
            "summary": "The global performance property returns a Performance object, which can be used to gather performance information about the context it is called in (window or worker).",
            "support": {
                "chrome": {
                    "version_added": "6"
                },
                "chrome_android": "mirror",
                "deno": {
                    "version_added": "1.0"
                },
                "edge": {
                    "version_added": "12"
                },
                "firefox": {
                    "version_added": "7"
                },
                "firefox_android": "mirror",
                "ie": {
                    "version_added": "9"
                },
                "oculus": "mirror",
                "opera": "mirror",
                "opera_android": "mirror",
                "safari": {
                    "version_added": "8"
                },
                "safari_ios": {
                    "version_added": "9"
                },
                "samsunginternet_android": "mirror",
                "webview_android": {
                    "version_added": "37"
                },
                "edge_blink": {
                    "version_added": "79"
                }
            },
            "title": "performance global property"
        }
    ]
}