{"json_modified": "2016-03-28T08:48:54.651610", "uuid": "43c705ac-79ee-4ba4-8e84-f27689ad1172", "title": "PerformanceMeasure", "url": "/en-US/docs/Web/API/PerformanceMeasure", "tags": ["Web Performance", "Reference", "Interface", "API"], "translations": [], "modified": "2015-12-29T06:27:55", "label": "PerformanceMeasure", "localization_tags": [], "locale": "en-US", "id": 169681, "last_edit": "2015-12-17T15:52:37", "summary": "<code><strong>PerformanceMeasure</strong></code> is an <em>abstract</em> interface for <a href=\"/en-US/docs/Web/API/PerformanceEntry\" title=\"The PerformanceEntry object encapsulates a single performance metric that is part of the performance timeline. A performance entry can be directly created by making a performance mark or measure (for example by calling the mark() method) at an explicit point in an application. Performance entries are also created in indirect ways such as loading a resource (such as an image).\"><code>performance entries</code></a> with an <a href=\"/en-US/docs/Web/API/PerformanceEntry/entryType\" title=\"The entryType property returns the performance entry's type. The valid entryType values are:\"><code>entry type</code></a> of \"<code>measure</code>\". Entries of this type are created by calling <a href=\"/en-US/docs/Web/API/Performance/measure\" title=\"The measure() method creates a named timestamp in the browser's performance entry buffer between two specified marks (known as the start mark and end mark, respectively). The named timestamp is referred to as a measure.\"><code>performance.measure()</code></a> to add a <em>named</em> <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>DOMHighResTimeStamp</code></a> (the <em>measure</em>) between two <em>marks</em> to the browser's <em>performance timeline</em>.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Properties", "title": "Properties"}, {"id": "Methods", "title": "Methods"}, {"id": "Example", "title": "Example"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "slug": "Web/API/PerformanceMeasure", "review_tags": ["technical"]}