- From: Boris Zbarsky <bzbarsky@MIT.EDU>
- Date: Fri, 29 Mar 2013 13:18:29 -0400
- To: "Tab Atkins Jr." <jackalmage@gmail.com>
- CC: www-style list <www-style@w3.org>
On 3/29/13 1:03 PM, Tab Atkins Jr. wrote:
> Oh, no, not at all. You still want to return the used value *of the
> 'width' property*. 'box-sizing' changes how the 'width' property is
> interpreted when figuring out the width of the content box, but it
> doesn't actually change the value of the 'width' property itself.
Uh... it can't possibly work that way, because the used width
participates in this equation in CSS2.1 section 10.3.3:
'margin-left' + 'border-left-width' + 'padding-left' + 'width' +
'padding-right' + 'border-right-width' + 'margin-right' = width of
containing block
or in this one in CSS3 Box draft section 15.3 if you prefer:
start margin + start border + start padding + inline dimension + end
padding + end border + end margin = inline dimension of containing block
So the used "inline dimension" or "width", depending on which of those
specs you read, is 100% definitely affected by box-sizing.
-Boris
Received on Friday, 29 March 2013 17:18:57 UTC