This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The addNextPaintListener() method of the HTMLIFrameElement is used to define a handler to listen for the next MozAfterPaint event coming from the browser <iframe>.

This event provides information about what has been repainted. It is mainly used to investigate performance optimization.

Note: The handler will receive the event once and then be thrown away.






A function handler to listen for a MozAfterPaint event.


var browser = document.querySelector('iframe');

function onNextPaint() {
  console.log("Paint has occured");



Not part of any specification.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support No support 47 (47)[1] No support No support No support
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support No support No support No support No support No support No support

[1] Supported in chrome code only.

See also

Document Tags and Contributors

 Contributors to this page: chrisdavidmills, teoli, ajaybhat, kscarfone, Jeremie
 Last updated by: chrisdavidmills,