ParentChildLayout:Default Parent Child Layout

Build 252 on layout-storybook-examples
1200px
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The baseline is shorter than the new snapshot (1000x701 to 1000x717).
Baseline History
Build 252858809f
Current build. There are unaccepted changes, so build 137 is still the baseline.
Build 137d21155e current baseline
Accepted by Fernanda Castillo.
Build 16035ab45
Accepted by Zhihao Cui.
Build 1cf98200
Auto-accepted
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