[whatwg] Bad CSS on the multipage version

[Tab Atkins Jr.]

On Wed, Jun 4, 2008 at 8:43 AM, Philip Taylor
<excors+whatwg at gmail.com<excors%2Bwhatwg at gmail.com>>
wrote:

> On 04/06/2008, Křištof Želechovski <giecrilj at stegny.2a.pl> wrote:
> > Regarding your page at the URL
> >  <
> http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level.html
> >  #the-embed>:
> >  [...]
> >  Element headings (level 4) are invisible
> >  (obscured underneath the following content).
>
> Seems to be an IE CSS bug like in
>
> http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C!DOCTYPE%20html%3E%0D%0A%3Cstyle%3E%0D%0A%20.a%20%7B%20border%3A2px%20blue%20solid%20%7D%0D%0A%20.b%20%7B%20border%3A2px%20green%20solid%3B%20background%3Ayellow%3B%20margin-top%3A-0.8em%20%7D%0D%0A%3C%2Fstyle%3E%0D%0A%3Cdiv%20class%3Da%3EThis%20text%20should%20be%20visible%20on%20top%20of%20the%20yellow%0D%0A%20%3Cdiv%20class%3Db%3E...%3C%2Fdiv%3E%0D%0A%3C%2Fdiv%3E<http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C%21DOCTYPE%20html%3E%0D%0A%3Cstyle%3E%0D%0A%20.a%20%7B%20border%3A2px%20blue%20solid%20%7D%0D%0A%20.b%20%7B%20border%3A2px%20green%20solid%3B%20background%3Ayellow%3B%20margin-top%3A-0.8em%20%7D%0D%0A%3C%2Fstyle%3E%0D%0A%3Cdiv%20class%3Da%3EThis%20text%20should%20be%20visible%20on%20top%20of%20the%20yellow%0D%0A%20%3Cdiv%20class%3Db%3E...%3C%2Fdiv%3E%0D%0A%3C%2Fdiv%3E>
>
> That case fails in IE7; it works in IE8 (and in recent versions of
> Firefox, Opera, Safari, Konqueror).
>
> I don't know if there's a 'proper' way to fix this, but adding
>   h4 { position: relative; }
> into the page's CSS makes it work correctly in IE7, and doesn't affect
> any other browser.
>
> --
> Philip Taylor
> excors at gmail.com
>

If that fixes it, then it's almost certainly a hasLayout issue (that is, an
IE7 bug).  Position:relative is a hasLayout trigger in IE7.  Generally
speaking, an element's behavior when it has layout is the correct behavior
(or at least *more* correct).

~TJ
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