Alert:Main demo

Build 344 on francesca/tooltip-tab
1200px
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Baseline History
Build 3445622d77
Current build. There are unaccepted changes, so build 276 is still the baseline.
Build 2165bef27b
Accepted by Frankie Yan.
Build 98c79eaf8
Auto-accepted
Build 3f995a39
Accepted by Ernesto García.
Commenting is disabled because there's a newer build on this branch