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 box-shadow increases document dimensions 
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Joined: Mon Oct 10, 2011 8:21 am
Posts: 5
Post box-shadow increases document dimensions
Sorry, I posted this once already and then confused myself into thinking I was wrong. Unfortunately, I wasn't.

Consider a footer div, positioned at the bottom of a document. There are no scrollbars present on the window because the document doesn't exceed the available window space. Now, if you give the div PIE and add a box-shadow, scrollbars appear on the window in IE 9 and lower, but not in other browsers that support box-shadow natively. PIE needs to perform a few calculations to see if the shadow would exceed the document bounds and, if necessary, clip the shadow accordingly.

To work around the problem, I had to add extra <div> elements to the markup and style them with overflow:hidden; to clip the shadow manually. It would be nice, though, if I could keep the markup clean and have PIE take care of this for me.

Tue Oct 11, 2011 6:07 am

Joined: Thu Apr 07, 2011 3:23 am
Posts: 73
Post Re: box-shadow increases document dimensions
Yeah, I also tried to use a sticky footer + pie (like discussed in your other post), and that had size issues on old IEs. It seems that on recent browsers, the shadows don't have a significative size, and on old IEs with PIE, they do.

Anyway, I think that if PIE forced "overflow: hidden", that could cause too much problems.

Looking forward to Jason's answer on that...

Tue Oct 11, 2011 6:45 am

Joined: Mon Oct 10, 2011 8:21 am
Posts: 5
Post Re: box-shadow increases document dimensions
I could see it causing DOM selection problems if the clipping element was a <div> or it changed the ancestral structure of the PIE'd element, but I think a solution may be achievable by applying overflow:hidden to the <css3-container> elements and then sizing them to clip the shadow.

I'd have a go at implementing a solution myself if I weren't up to my elbows in other cross-browser problems!

Tue Oct 11, 2011 10:07 am
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