PerformanceMeasure
is an abstract interface for {{domxref("PerformanceEntry","performance entries")}} with an {{domxref("PerformanceEntry.entryType","entry type")}} of "measure
". Entries of this type are created by calling {{domxref("Performance.measure","performance.measure()")}} to add a named {{domxref("DOMHighResTimeStamp")}} (the measure) between two marks to the browser's performance timeline.
The PerformanceMeasure
interface has no properties, no methods nor any constructors. However, it qualifies and constrains the following {{domxref("PerformanceEntry")}} properties for "measure
" type {{domxref("PerformanceEntry","performance entries")}}: {{domxref("PerformanceEntry.name","name")}}, {{domxref("PerformanceEntry.entryType","entryType")}}, {{domxref("PerformanceEntry.startTime","startTime")}} and {{domxref("PerformanceEntry.duration","duration")}}.
Properties
This interface has no properties but it extends the following {{domxref("PerformanceEntry")}} properties by qualifying/constrainting the properties as follows:
- {{domxref("PerformanceEntry.entryType","entryType")}}
- Set to "
measure
". - {{domxref("PerformanceEntry.name","name")}}
- Set to the
name
given to the measure when it was created via a call to {{domxref("Performance.measure()","performance.measure()")}}. - {{domxref("PerformanceEntry.startTime","startTime")}}
- Set to the {{domxref("DOMHighResTimeStamp","timestamp")}} when {{domxref("Performance.measure()","performance.measure()")}} was called.
- {{domxref("PerformanceEntry.duration","duration")}}
- Set to a {{domxref("DOMHighResTimeStamp")}} that is the duration of the measure (typically, the measure's end mark timestamp minus its start mark timestamp).
Methods
This interface has no methods.
Example
See the example in Using the User Timing API.
Specifications
Specification | Status | Comment |
---|---|---|
{{SpecName('User Timing Level 2', '#dom-performance-measure', 'PerformanceMeasure')}} | {{Spec2('User Timing Level 2')}} | |
{{SpecName('User Timing', '#performancemeasure', 'PerformanceMeasure')}} | {{Spec2('User Timing')}} | Basic definition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support. | 43 | 41 | 10 | 33 | {{CompatNo}} |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support. | 46 | 42 | 42 | 10 | 33 | {{CompatNo}} |