{"json_modified": "2016-08-11T15:14:22.217072", "uuid": "a872e30a-4b12-4331-bc23-b017465ed23c", "title": "PerformanceObserver", "url": "/en-US/docs/Web/API/PerformanceObserver", "tags": ["Web Performance", "Reference", "Interface", "API"], "translations": [], "modified": "2016-08-11T15:14:22", "label": "PerformanceObserver", "localization_tags": [], "locale": "en-US", "id": 168497, "last_edit": "2016-08-11T15:14:15", "summary": "The <strong><code>PerformanceObserver</code></strong> interface is used to <em>observe</em> performance measurement events and be notified of new <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).\">performance entries</a> as they are recorded in the browser's <em>performance timeline</em>.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Constructor", "title": "Constructor"}, {"id": "Methods", "title": "Methods"}, {"id": "Example", "title": "Example"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}], "slug": "Web/API/PerformanceObserver", "review_tags": []}