{"json_modified": "2016-03-28T08:29:02.895156", "uuid": "5f506e86-a11c-465a-83e6-e134b59164d9", "title": "PerformanceTiming.navigationStart", "url": "/en-US/docs/Web/API/PerformanceTiming/navigationStart", "tags": ["API", "Navigation Timing", "Read-only", "Reference", "Property", "Performance", "R\u00e9f\u00e9rence", "PerformanceTiming.navigationStart"], "translations": [], "modified": "2015-02-22T10:50:54", "label": "PerformanceTiming.navigationStart", "localization_tags": [], "locale": "en-US", "id": 81395, "last_edit": "2015-02-22T10:47:26", "summary": "The <code><strong>PerformanceTiming</strong></code><strong><code>.navigationStart</code></strong> read-only property returns an <code>unsigned long long</code> representing the moment, in miliseconds since the UNIX epoch, right after the prompt for unload terminates on the previous document in the same browsing context. If there is no previous document, this value will be the same as <a href=\"/en-US/docs/Web/API/PerformanceTiming/fetchStart\" title=\"The PerformanceTiming.fetchStart read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, the browser is ready to fetch the document using an HTTP request. This moment is before the check to any application cache.\"><code>PerformanceTiming.fetchStart</code></a>.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Summary", "title": "Summary"}, {"id": "Syntax", "title": "Syntax"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "slug": "Web/API/PerformanceTiming/navigationStart", "review_tags": []}