- From: Boris Zbarsky <bzbarsky@MIT.EDU>
- Date: Tue, 07 Jan 2014 15:06:51 -0500
- To: Ian Hickson <ian@hixie.ch>
- Cc: whatwg <whatwg@lists.whatwg.org>, Yoav Weiss <yoav@yoav.ws>
On 1/7/14 2:24 PM, Ian Hickson wrote:
> It's probably just a matter of saying, in the rendering section, that nested browsing contexts that
> aren't _being_rendered_ (or that are <frame>s outside <frameset>s) get a
> 0x0 viewport.
That doesn't seem unreasonable.
> (Viewports that are being rendered seem to have an
> unambiguous dimension
Actually, nothing defines this either. It should be the content box of
the <iframe>, assuming iframes can't get fragmented. If they can be
fragmented, I have no idea.
> Right now, Chrome and Firefox seem to report 0 as the body.offsetWidth for
> a hidden iframe. (Couldn't get a result for Safari; don't have IE here.)
>
> http://software.hixie.ch/utilities/js/live-dom-viewer/saved/2725
> For Chrome (since it puts data: in the wrong origin)
>
> http://software.hixie.ch/utilities/js/live-dom-viewer/saved/2726
> For Firefox (since for some reason the message in 2725 isn't sent?)
>
> Can you elaborate on the widly different things? What should I be testing?
How about this testcase:
<!DOCTYPE html>
<style>
div { color: purple; }
</style>
<link rel="stylesheet" href="data:text/css,%23one { color: yellow; }"
media="(min-width: 300px)">
<link rel="stylesheet" href="data:text/css,%23two { color: yellow; }"
media="(max-width: 300px)">
<div id="one"></div>
<div id="two"></div>
<script>
window.onload = function() {
alert(getComputedStyle(document.getElementById("one"), "").color +
" | " +
getComputedStyle(document.getElementById("two"), "").color);
}
</script>
and variants on it. From my testing, in a display:none iframe:
1) Presto-based Opera treats the viewport width as 300px for purposes
of the media queries and reports a document.body.offsetWidth of 0.
2) Blink and WebKit both seems to treat the viewport width as 0 when
measured using either method.
3) Gecko doesn't allow creation of computed style objects in an iframe
that's not being rendered and reports a document.body.offsetWidth of 0.
4) IE11 seems to do what Blink/WebKit do.
-Boris
Received on Tuesday, 7 January 2014 20:07:28 UTC