The domainLookupEnd property must return the time immediately after the user agent finishes the domain name lookup for the current document. If a persistent connection is used or the current document is retrieved from relevant application caches or local resources, this property must return the same value as fetchStart.
An Integer value that represents the time immediately after the user agent finishes the domain name lookup for the current document.
- Navigation Timing, Section 4.2
If a page is retrieved from an application cache, domainLookupEnd will have the same value as fetchStart.
The value reported by the domainLookupEnd property represents the number of milliseconds between the recorded time and midnight January 1, 1970 (UTC).
The following example shows how to calculate the amount of time to complete a domain name request for the document.
var oTiming = window.performance.timing; var iTimeMS = oTiming.domainLookupEnd - oTiming.domainLookupStart;