/Web APIs


Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The msWriteProfilerMark method writes a profiling event.

This proprietary method is specific to Internet Explorer and Microsoft Edge.





An event name. Type = String. This parameter may be null.

Return value

Type: HRESULT. If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.


msWriteProfilerMark enables you to inject DOM based performance markers in addition to existing Javascript API to learn exactly when parts of the page are being rendered, building a waterfall view for every one of our impressions showing latency per object, which can be useful for more accurately debugging real users perf issues.

Internet Explorer 10. This method is also available in the Web Worker global scope.

For Windows XP, this method sends an event to an event tracing session with TraceEvent; for systems after Windows XP, this method writes an event with EventWrite.

The event includes a pointer to a window object, current markup, and the event name passed as bstrProfilerMarkName.

The bstrProfilerMarkName property has a 32-character limit when called from script.

This method is useful to profile real website performance by using the operating system metrics as a baseline.


if (msWriteProfilerMark) {

See also

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