Alert:Main demo

Build 336 on ernesto/fix-tab-click
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Baseline History
Build 33671f0319
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.
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