PerformanceResourceTiming.domainLookupEnd

The domainLookupEnd read-only property returns the timestamp immediately after the browser finishes the domain name lookup for the resource.

If the user agent has the domain information in cache, domainLookupStart and domainLookupEnd represent the times when the user agent starts and ends the domain data retrieval from the cache.

Note: This feature is available in Web Workers

Value

A DOMHighResTimeStamp representing the time immediately after the browser finishes the domain name lookup for the resource.

Examples

In the following example, the value of the *Start and *End properties of all "resource" type events are logged.

function printPerformanceEntries() {
  // Use getEntriesByType() to just get the "resource" events
  performance.getEntriesByType("resource")
    .forEach((entry) => {
      printStartAndEndProperties(entry);
    });
}

function printStartAndEndProperties(perfEntry) {
  // Print timestamps of the *start and *end properties
  properties = ["connectStart", "connectEnd",
                "domainLookupStart", "domainLookupEnd",
                "fetchStart",
                "redirectStart", "redirectEnd",
                "requestStart",
                "responseStart", "responseEnd",
                "secureConnectionStart"];

  for (const property of properties) {
    // Log the property
    console.log(`${property} = ${perfEntry[property] ?? "NOT supported"}`);
  }
}

Specifications

Specification
Resource Timing Level 2
# dom-performanceresourcetiming-domainlookupend

Browser compatibility

BCD tables only load in the browser