The onresourcetimingbufferfull property is an event handler that will be called when the resourcetimingbufferfull event is fired. This event is fired when the browser's resource timing performance buffer is full. 
Note: This feature is available in Web Workers
callback = performance.onresourcetimingbufferfull = buffer_full_cb;
 An event handler that is invoked when the resourcetimingbufferfull event is fired. 
 The following example sets a callback function on the onresourcetimingbufferfull property. 
function buffer_full(event) { console.log("WARNING: Resource Timing Buffer is FULL!"); performance.setResourceTimingBufferSize(200); } function init() { // Set a callback if the resource buffer becomes filled performance.onresourcetimingbufferfull = buffer_full; } <body onload="init()">
| Specification | 
|---|
| Resource Timing Level 2 (Resource Timing 2) # dom-performance-onresourcetimingbufferfull  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onresourcetimingbufferfull | 
 46 
22-57 
 | 
79  | 
35  | 
No  | 
No  | 
11  | 
 46 
≤37-57 
 | 
 46 
25-57 
 | 
35  | 
Yes  | 
No  | 
 5.0 
1.5-7.0 
 | 
resourcetimingbufferfull eventPerformance.clearResourceTimings()Performance.setResourceTimingBufferSize()
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    https://developer.mozilla.org/en-US/docs/Web/API/Performance/onresourcetimingbufferfull