{"json_modified": "2016-03-28T08:48:51.742862", "uuid": "21c7773c-2678-4fc5-86cf-89eedc747543", "title": "PerformanceResourceTiming.responseStart", "url": "/en-US/docs/Web/API/PerformanceResourceTiming/responseStart", "tags": ["Web Performance", "Reference", "API", "Property"], "translations": [], "modified": "2016-03-01T07:47:47", "label": "PerformanceResourceTiming.responseStart", "localization_tags": [], "locale": "en-US", "id": 169205, "last_edit": "2016-03-01T07:47:45", "summary": "The <strong><code>responseStart</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> immediately after the browser receives the first byte of the response from the server, cache, or local resource.", "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/responseStart", "review_tags": ["technical"]}