{"json_modified": "2016-03-28T08:48:50.781805", "uuid": "99da468a-1b17-489c-8298-de48d94b9400", "title": "PerformanceResourceTiming.workerStart", "url": "/en-US/docs/Web/API/PerformanceResourceTiming/workerStart", "tags": ["Web Performance", "Reference", "API", "Property"], "translations": [], "modified": "2016-03-01T05:23:29", "label": "PerformanceResourceTiming.workerStart", "localization_tags": [], "locale": "en-US", "id": 169179, "last_edit": "2016-03-01T05:23:26", "summary": "If the current context is a <a href=\"/en-US/docs/Web/API/Worker\" title=\"The Worker interface of the Web Workers API represents a background task that can be easily created and can send messages back to its creator. Creating a worker is as simple as calling the Worker()&#xA0;constructor and specifying a script to be run in the worker thread.\"><code>worker</code></a>, the <strong><code>workerStart</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 before the worker that fetches the resource is started. If the context is not a worker (i.e. a <em>browser context</em>), this property returns zero.", "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/workerStart", "review_tags": ["technical"]}