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    Performance

    The Performance interface represents timing related performance information for the given page.

    An object of this type can be obtained by calling the Window.performance read-only attribute.

    Properties

    The Performance interface doesn't inherit any property.

    Performance.timing Read only
    Is a PerformanceTiming object containing latency-related performance information.
    Performance.navigation Read only
    Is a PerformanceNavigation object representing the type of navigation that occurs in the given browsing context, like the amount of redirections needed to fetch the resource.

    Methods

    The Performance interface doesn't inherit any method.

    Performance.now()
    Returns a DOMHighResTimeStamp representing the amount of miliseconds elapsed since the start of the navigation, as give by PerformanceTiming.navigationStart to the call of the method.
    Performance.toJSON()
    Is a jsonizer returning a json object representing the Performance object.

    Specifications

    Specification Status Comment
    High Resolution Time Recommendation Added the now() method.
    Navigation Timing Recommendation Initial definition.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support (timing attribute) 6.0 7.0 (7.0) 9.0 15.0 Not supported
    navigation attribute Not supported Not supported 9.0 Not supported Not supported
    now() 20.0 webkit
    24.0
    15.0 (15.0) 10.0 Not supported Not supported
    toJSON() Not supported 25.0 (25.0) 9.0 Not supported Not supported
    Feature Android Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
    Basic support Not supported 7.0 (7.0) 1.0 (7.0) 9.0 15.0 Not supported
    navigation attribute Not supported Not supported Not supported 9.0 Not supported Not supported
    now() 20.0 webkit
    24.0
    15.0 (15.0) 1.0 (15.0) 10.0 Not supported Not supported
    toJSON() Not supported 25.0 (25.0) 1.2 (25.0) 9.0 Not supported Not supported

    See also

    Document Tags and Contributors

    Contributors to this page: teoli
    Last updated by: teoli,