{"json_modified": "2016-08-10T13:57:34.828700", "uuid": "9fefdcee-46ba-4429-99fb-7e5b7b898eae", "title": "Performance.mark()", "url": "/en-US/docs/Web/API/Performance/mark", "tags": ["Web Performance", "Reference", "API", "Method"], "translations": [], "modified": "2016-08-10T13:57:35", "label": "Performance.mark()", "localization_tags": [], "locale": "en-US", "id": 169591, "last_edit": "2016-08-10T13:57:26", "summary": "The <strong><code>mark()</code></strong> method creates 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 (due, for example, to hardware or software constraints), the browser can represent the value as a time in milliseconds accurate to a millisecond.\"><code>timestamp</code></a> in the browser's <em>performance entry buffer</em> with the given name. The application defined timestamp can be retrieved by one of the <a href=\"/en-US/docs/Web/API/Performance\" title=\"The Performance interface represents timing-related performance information for the given page.\"><code>Performance</code></a> interface's <code>getEntries*()</code> methods (<a href=\"/en-US/docs/Web/API/Performance/getEntries\" title=\"The getEntries() method returns a list of PerformanceEntry objects for a given filter. The list's members (entries) can be created by making performance marks or measures (for example by calling the mark() method) at explicit points in time.\"><code>getEntries()</code></a>, <a href=\"/en-US/docs/Web/API/Performance/getEntriesByName\" title=\"The getEntriesByName() method returns a list of PerformanceEntry objects for the given name and type. The list's members (entries) can be created by making performance marks or measures (for example by calling the mark() method) at explicit points in time.\"><code>getEntriesByName()</code></a> or <a href=\"/en-US/docs/Web/API/Performance/getEntriesByType\" title=\"The getEntriesByType() method returns a list of PerformanceEntry objects for a given type. The list's members (entries) can be created by making performance marks or measures (for example by calling the mark() method) at explicit points in time.\"><code>getEntriesByType()</code></a>).", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Arguments", "title": "Arguments"}, {"id": "Return_value", "title": "Return value"}, {"id": "Example", "title": "Example"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}], "slug": "Web/API/Performance/mark", "review_tags": ["technical"]}