[Webkit-unassigned] [Bug 103470] Fixed position element under transformed element causes slow scrolling on Chromium

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103470





--- Comment #1 from James Robinson <jamesr at chromium.org>  2012-11-27 18:15:44 PST ---
http://dev.w3.org/csswg/css3-transforms/#transform-rendering says:

For elements whose layout is governed by the CSS box model, any value other than ‘none’ for the transform results in the creation of both a stacking context and a containing block. The object acts as a containing block for fixed positioned descendants.

NOTE: Is this effect on position:fixed necessary? If so, need to go into more detail here about why fixed positioned objects should do this, i.e., that it's much harder to implement otherwise. See Bug 16328.

Related bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=16328

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