QA:QA

Build 13021 on POC/css-extraction
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Baseline History
Build 13021d02ce80
Current build. There are unaccepted changes, so build 12956 is still the baseline.
Build 12953a34975a
Accepted by Zhihao Cui.
Build 1291561007a3
Accepted by Zhihao Cui.
Build 12906d16519e
Accepted by Zhihao Cui.
Commenting is disabled because there's a newer build on this branch