Palettes:Media Palette

Build 4576 on sm-pullquotes
1200px
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Baseline History
Build 457692fdc75
Current build. There are unaccepted changes, so build 3963 is still the baseline.
Build 24617405ee1
Auto-accepted
Build 207681411e8
Accepted by Daniel Clifton.
Build 20551a01a5b
Accepted by Anna Beddow.
Commenting is disabled because there's a newer build on this branch