Writes a profiling event.
An event name. This parameter may be null.
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
There are no standards that apply here.
Internet Explorer 10. This method is also available in the Web Worker global scope.
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.