NEW 198454
Optimize for negative z children on the root 
https://bugs.webkit.org/show_bug.cgi?id=198454
Summary Optimize for negative z children on the root
Simon Fraser (smfr)
Reported 2019-06-01 10:55:22 PDT
Created attachment 371114 [details] Testcase It's pretty common to have negative z-index children in the root stacking context. Currently, we'll pop in to adding a foreground layer, which will become tiled and double our tiled backing store memory use. We could, in some cases, use the page tiles for the foreground, and just have a solid color background behind the negative z-index child.
Attachments
Testcase (1.69 KB, text/html)
2019-06-01 10:55 PDT, Simon Fraser (smfr) 		no flags
Details
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