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.
The visible state of a browser
<iframe> has nothing to do with its actual visibility (which is handled through CSS). The visible state is used to define the level of resources required by the browser
<iframe>. If the visible state is set to
true, it means that the browser
<iframe> should have high priority over the resources needed to render and handle its content. On the contrary, if its visible state is set to
false, it has low priority over the resources it needs.
As an example, if the content of a browser
<iframe> uses the
window.requestAnimationFrame method and if the visible state is set to
window.requestAnimationFrame will be called as often as necessary. However, if the visible state is set to
window.requestAnimationFrame will be called only when there are free resources to do it.
var browser = document.querySelector('iframe'); browser.setVisible(true);
Not part of any specification.
|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
embed-apps permissions, depending on what you want to do. See Using the Browser API for more details.