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[Bug 7978] Form foster parenting introduces extra space to layout

From: <bugzilla@wiggum.w3.org>
Date: Mon, 26 Oct 2009 15:11:34 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1N2REM-0001nz-3g@wiggum.w3.org>

--- Comment #12 from Boris Zbarsky <bzbarsky@mit.edu>  2009-10-26 15:11:33 ---
> You could end up with this tree in HTML too with scripting. Does it matter?

Apparently not, since Mozilla has gotten no bug reports on it, unlike the other
approaches we've tried here.

> Could we use :empty instead of :htmlness if it matters, or is that more
> expensive?

:empty is certainly more expensive; I can't say how much more offhand.  In some
cases it's probably not noticeable at all.  On the other hand, I can certainly
construct pathological testcases which cause :empty to trigger O(N) behavior on
append in Gecko.  I can't speak to other engines.

Comment 11 sounds good.

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