Card:Video Youtube Default

Build 6381 on 23-04-ZL-fix-video-block-display
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Baseline History
Build 6381d418588
Current build. There are unaccepted changes, so build 6310 is still the baseline.
Build 6309aa5de71
Accepted by Ziwei Liu.
Build 6302543a539
Accepted by Ziwei Liu.
Build 62880ed2c1d
Accepted by Ziwei Liu.
Commenting is disabled because there's a newer build on this branch