Browser API: implement iframe.zoom()

[paulrouget]

So I believe the right way to implement that is, from the iframe, send a constellation message with the subpage id, from constellation, get the scrip chan, send a zoom message, and in script_task.rs, handle the zoom message.

Then, I'm not sure when to perform the actual zooming. Should we append an event to the window and handle it ScriptTask::handle_msgs?

If so, could we imagine instead using the resize event (which uses the same path) and add an extra parameter for the zoom value?

/cc @glennw

[paulrouget]

https://github.com/paulrouget/mozBrowserAPI/blob/master/BrowserAPI.md#the-zoom-method

[mbrubeck]

This will also need new code in the compositor to set the zoom of an iframe. Currently it only knows how to zoom the top-level window.

[paulrouget]

@mbrubeck any update on this?

[mbrubeck]

No, sorry. Unassigning myself for now, but I'll try to get back to this soon if someone else doesn't fix it in the meantime.

[mason-larobina]

Zooming the top-level window has unexpected results on my machine (though it could be a poor interaction with my window manager).

[jdm]

@mason-larobina Could you file a new issue for that? This one is tracking a DOM API for use in browser.html that has not been implemented yet.

[mason-larobina]

Done #12187

(Just to check, did you mean a servo or bhtml issue?)

[jdm]

I meant servo. Thanks!

[paulrouget]

We shipped the first alpha of browserhtml we are planning to move away from the Browser API. Closing.