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Re: Expected behavior of background-clip property on the html element?

From: Alan Gresley <alan@css-class.com>
Date: Wed, 19 Jan 2011 22:37:33 +1100
Message-ID: <4D36CCFD.4060808@css-class.com>
To: Philippe Wittenbergh <ph.wittenbergh@l-c-n.com>
CC: "www-style@w3.org CSS" <www-style@w3.org>
On 12/01/2011 7:58 PM, Philippe Wittenbergh wrote:
>
> On Jan 12, 2011, at 5:01 PM, Alan Gresley wrote:

>> The UA dependent background-color is the white (this
>> background-color is the default background setting of the UA) that
>> the test show. I can only assume that in Opera 11 and Safari 5 that
>> the root element is not<html>. This beckons the questions like, is
>> there an initial block formatting context.
>
> You're misunderstanding something I suspect. In both Safari/Chrome
> and Opera the background applied to the root element is propagated to
> the canvas and then clipped (completely erroneously in Opera,
> sort-of-correctly in WebKit [*] - although it shouldn't clip at
> all.)


Agree. Safari seem to begin the padding from the where the background is 
clipped.


> And I don't see how you conclude from that in Opera and WebKit,
> the root element is not<html>  in those testcases.


Seems that Opera 11 doesn't have the sames issues as Opera 10.5 or 
earlier. Right up to Opera 10.6.?? you could create an element outside 
of <html>. It was a way you could hack Opera.

<http://css-class.com/test/bugs/opera/background-clip-html-body-xml.htm>


In any version of Opera pre 10.6.?? the above demo can show this. 
Reminds me of the infamous peekaboo bug of IE7-.

<http://css-class.com/test/temp/opera-10-5-root.png>


I have seen this element before in Opera. It's canvas is black and 
changing the background color from preferences wouldn't change it. It 
was happening on pages where there is a mysterious space of 40px on the 
right. Under some circumstances scrolling left would reveal a black 
strip of 40px wide along the left edge of the viewport. I can't remember 
where I was saw it and I not sure if Opera 11 still has the bug.


-- 
Alan http://css-class.com/

Armies Cannot Stop An Idea Whose Time Has Come. - Victor Hugo
Received on Wednesday, 19 January 2011 11:39:08 GMT

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