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The fetchStart
property represents a timestamp
immediately before the browser starts to fetch the resource.
If there are HTTP redirects the property returns the time immediately before the user agent starts to fetch the final resource in the redirection.
This property is Read only .
Syntax
resource.fetchStart;
Return value
A DOMHighResTimeStamp
immediately before the browser starts to fetch the resource.
Example
In the following example, the value of the *Start
and *End
properties of all "resource
" type
events are logged.
function print_PerformanceEntries() { // Use getEntriesByType() to just get the "resource" events var p = performance.getEntriesByType("resource"); for (var i=0; i < p.length; i++) { print_start_and_end_properties(p[i]); } } function print_start_and_end_properties(perfEntry) { // Print timestamps of the PerformanceEntry *start and *end properties properties = ["connectStart", "connectEnd", "domainLookupStart", "domainLookupEnd", "fetchStart", "redirectStart", "redirectEnd", "requestStart", "responseStart", "responseEnd", "secureConnectionStart"]; for (var i=0; i < properties.length; i++) { // check each property var supported = properties[i] in perfEntry; if (supported) { var value = perfEntry[properties[i]]; console.log("... " + properties[i] + " = " + value); } else { console.log("... " + properties[i] + " = NOT supported"); } } }
Specifications
Specification | Status | Comment |
---|---|---|
Resource Timing The definition of 'fetchStart' in that specification. |
Editor's Draft | Initial definition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support. | 43 | 40 | 10 | 32 | No support |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support. | 4.4 | 42 | ? | 10.0 | 32 | No support |