RESOLVED FIXED 78812
Removing the last presentation attribute should result in a null attributeStyle(). 
https://bugs.webkit.org/show_bug.cgi?id=78812
Summary Removing the last presentation attribute should result in a null attributeSty...
Andreas Kling
Reported 2012-02-16 07:40:50 PST
Hanging an empty attribute style on a StyledElement is a waste of resources. If updateAttributeStyle() doesn't find any presentation attributes we should set a null attributeStyle.
Attachments
Patch (2.65 KB, patch)
2012-02-16 07:45 PST, Andreas Kling 		koivisto: review+
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Andreas Kling
Comment 1 2012-02-16 07:45:48 PST
Created attachment 127377 [details] Patch
Andreas Kling
Comment 2 2012-02-16 08:18:01 PST
Comment on attachment 127377 [details] Patch We can avoid the heap allocation altogether if we don't have any presentation attributes..
Andreas Kling
Comment 3 2012-02-16 08:33:12 PST
Comment on attachment 127377 [details] Patch Actually, calling the isPresentationAttribute() virtual on every attribute is more expensive than avoiding the temporary StylePropertySet.
Eric Seidel (no email)
Comment 4 2012-02-16 15:09:58 PST
So this is a performance fix? Memory fix? Or is this in any way visible to the web?
Andreas Kling
Comment 5 2012-02-17 01:02:05 PST
Committed r108049: <http://trac.webkit.org/changeset/108049>
Andreas Kling
Comment 6 2012-02-17 01:21:01 PST
(In reply to comment #4) > So this is a performance fix? Memory fix? Or is this in any way visible to the web? It's a small performance and memory fix for cases where removing an attribute on an element and causing it to no longer have any presentation attributes is slightly more efficient.
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