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The transferSize
read-only property represents the size (in octets) of the fetched resource. The size includes the response header fields plus the response payload body (as defined by RFC7230.
If the resource is fetched from a local cache, this property returns zero.
Syntax
resource.transferSize;
Return value
A number
representing the size (in octets) of the fetched resource. The size includes the response header fields plus the response payload body (RFC7230).
Example
The following example, the value of size properties of all "resource
" type
events are logged.
function log_sizes(perfEntry){ // Check for support of the PerformanceEntry.*size properties and print their values // if supported. if ("decodedBodySize" in perfEntry) console.log("decodedBodySize = " + perfEntry.decodedBodySize); else console.log("decodedBodySize = NOT supported"); if ("encodedBodySize" in perfEntry) console.log("encodedBodySize = " + perfEntry.encodedBodySize); else console.log("encodedBodySize = NOT supported"); if ("transferSize" in perfEntry) console.log("transferSize = " + perfEntry.transferSize); else console.log("transferSize = NOT supported"); } function check_PerformanceEntries() { // Use getEntriesByType() to just get the "resource" events var p = performance.getEntriesByType("resource"); for (var i=0; i < p.length; i++) { log_sizes(p[i]); } }
Specifications
Specification | Status | Comment |
---|---|---|
Resource Timing The definition of 'transferSize' in that specification. |
Editor's Draft | Initial definition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support. | 54.0 | No support | No support | 41 | No support |
Feature | Android | Android Webview | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|---|
Basic support. | No support | 54.0 | No support | No support | No support | 41 | No support | 54.0 |