[whatwg] getSelection() in a display:none iframe

[Ojan Vafai]

http://www.whatwg.org/specs/web-apps/current-work/#dom-getselection

Gecko returns null for a display:none iframe, but returns an empty Selection
object for a visible iframe with no selection. As best I can tell, WebKit
and Opera return a selection in both cases. I don't feel strongly about
which behavior is correct, but the spec should deal with this case.

On the one hand, the Gecko behavior makes sense because you can't have a
selection in a display:none frame, so the methods to set a selection would
fail. On the other hand, you can get into a similar situation by getting a
Selection and then making the iframe display:none, so that case needs to be
dealt with either way.

Relevant bugs:
https://bugzilla.mozilla.org/show_bug.cgi?id=585229
https://bugs.webkit.org/show_bug.cgi?id=43655

Ojan
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