The domLoading property must return the time immediately before the user agent sets the current document readiness to loading.
An Integer value that represents the time immediately before the user agent sets the current document readiness to loading.
- Navigation Timing, Section 4.2
The value of the domLoading property is controlled by the readyState property of the document object associated with the window object. The value of the domLoading property is updated when the readyState property is set to
loading. If the document cannot be loaded, the value of the domLoading property is available after the onload event has finished executing.
The value reported by the domLoading property represents the number of milliseconds between the recorded time and midnight January 1, 1970 (UTC).
Windows Internet Explorer 9. This property is supported only for documents displayed in IE9 Standards mode. For more information, see Defining Document Compatibility.
The following example shows how to calculate the time required to initialize the DOM for the document.
var oTiming = window.performance.timing; var iLoadTimeMS = oTiming.domComplete - oTiming.domLoading;