[Webkit-unassigned] [Bug 15015] Most of www.aol.com redraws unnecessarily when headline/photo section changes

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=15015





------- Comment #3 from ddkilzer at webkit.org  2007-08-20 19:54 PDT -------
Created an attachment (id=16046)
 --> (http://bugs.webkit.org/attachment.cgi?id=16046&action=view)
Reduction v1

Here is a self-contained reduction of the issue.  Note that I "inlined" the
stylesheet (http://www.aolcdn.com/_media/aolp_v23b/main.css) so that no
external resources would be referenced, which is why it's over 80 Kb.  Also
note that I replaced the AOL JavaScript machinery with an update() script of my
own that basically does the same thing, except with a 1000 ms timeout instead
of 7000 ms.

The crux of this reduction is:

<br class="cl_l">

Removing this entirely causes the redraw to occur where expected.  Removing
just the class (which maps to "clear: left;"), causes the full width of the
page to be redrawn, but the height shrinks to the height of the content being
changed.

This is NOT the only issue, however.  Removing to similar <br> tags in the
original www.aol.com source does not fix the redraw issues.  (It DOES reduce
the redraw footprint, though, only requiring two-thirds of the width of the
page to be redrawn.)


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