- From: Alan Gresley <alan@css-class.com>
- Date: Mon, 13 Sep 2010 15:52:44 +1000
- To: fantasai <fantasai.lists@inkedblade.net>
- CC: css21testsuite@gtalbot.org, "public-css-testsuite@w3.org" <public-css-testsuite@w3.org>, Arron Eicholz <arron.eicholz@microsoft.com>, Boris Zbarsky <bzbarsky@mit.edu>, "L. David Baron" <dbaron@dbaron.org>
fantasai wrote:
> On 09/05/2010 03:58 PM, "Gérard Talbot" wrote:
[snip]
>> ----------------------
>>
>> Author: Ian Hickson
>>
>> http://test.csswg.org/suites/css2.1/20100815/html4/root-box-003.htm
>>
>> <title>CSS Test: Styling the root element: display:none (page should be
>> a big green expanse)</title>
>>
>> <style type="text/css">
>> html { display: none; background: green; color: red; }
>>
>> If it is not supposed to be displayed, then how could it be painted? Why
>> should it be painted?
>>
>> "display of 'none' does not create an invisible box; it creates no box
>> at all."
>> http://www.w3.org/TR/CSS21/visuren.html#display-prop
>>
>> I do not think this testcase should be approved.
>
> This presents an interesting question. The background of the root element
> is supposed to be propagated to the canvas; it does not paint on the root
> element's box. Hixie's assertion is that it is therefore still painted
> even when the root box still exists, which makes sense.
>
> The interesting question is, where would background images be positioned
> if the root box doesn't exist? I don't think this testcase is wrong per
> spec, but it does have some interesting implications.
>
> ~fantasai
Any background images has no point from which it can be positioned
since the root element has no height. Such a box has infinite width
across the canvas but zero height. It exist on the x-axis only.
Using this test case,
http://css-class.com/test/css/visformatting/root-bfc-icb4a.htm
try two things. Give the <html> display:none and then swap the
display:none to the <body>. The first test shows similar to Hickson's
test. The later test,
body {display:none}
only shows the border for <html> filling the entire x-axis and it's
background-color is propagated to the canvas. The background-image is
not present since it is positioned within a zero height root element's
box.
--
Alan http://css-class.com/
Armies Cannot Stop An Idea Whose Time Has Come. - Victor Hugo
Received on Monday, 13 September 2010 05:53:20 UTC