{"json_modified": "2016-03-28T08:48:51.842848", "uuid": "db6d77cd-460b-410c-a82f-93207236b11f", "title": "PerformanceResourceTiming.requestStart", "url": "/en-US/docs/Web/API/PerformanceResourceTiming/requestStart", "tags": ["Web Performance", "Reference", "API", "Property"], "translations": [], "modified": "2016-03-01T07:48:49", "label": "PerformanceResourceTiming.requestStart", "localization_tags": [], "locale": "en-US", "id": 169207, "last_edit": "2016-03-01T07:48:46", "summary": "The <strong><code>requestStart</code></strong> property returns a <a href=\"/en-US/docs/Web/API/DOMHighResTimeStamp\" title=\"The DOMHighResTimeStamp type is a double and is used to store a time value. The value could be a discrete point in time or the difference in time between two discrete points in time. The unit is milliseconds and should be accurate to 5 &#xB5;s (microseconds). However, if the browser is unable to provide a time value accurate to 5 microseconds (because, for example, due to hardware or software constraints), the browser can represent the value as a time in milliseconds accurate to a millisecond.\"><code>timestamp</code></a> of the time immediately before the browser starts requesting the resource from the server, cache, or local resource. If the transport connection fails and the browser retires the request, the value returned will be the start of the retry request.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Return_Value", "title": "Return value"}, {"id": "Example", "title": "Example"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}], "slug": "Web/API/PerformanceResourceTiming/requestStart", "review_tags": ["technical"]}