Non-standard
This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
This API is available on Firefox OS for privileged or certified applications only.
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.
Syntax
instanceOfHTMLIframeElement.addNextPaintListener(listener);
Returns
Void.
Parameters
listener- A function handler to listen for a
MozAfterPaintevent.
Examples
var browser = document.querySelector('iframe'); function onNextPaint() { console.log("Paint has occured"); } browser.addNextPaintListener(onNextPaint);
Specification
Not part of any specification.
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | Not supported | Not supported | Not supported | Not supported | Not supported |
| Feature | Android | Firefox Mobile (Gecko) | Firefox OS (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | Not supported | Not supported | 1.0.1 | Not supported | Not supported | Not supported |
Note: Use of the Browser API requires a privileged app, and browser and/or embed-apps permissions, depending on what you want to do. See Using the Browser API for more details.