Bug 1673511 Comment 3 Edit History

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I cannot reproduce original issue, but I can reproduce https://github.com/webcompat/web-bugs/issues/61014 and https://github.com/webcompat/web-bugs/issues/59509, but both may be different root cause.

### https://github.com/webcompat/web-bugs/issues/61014
This uses Web component.

### https://github.com/webcompat/web-bugs/issues/59509
APZ supports root layer to scroll content, but search box in github seems to be have another layer.
I cannot reproduce original issue, but I can reproduce https://github.com/webcompat/web-bugs/issues/61014 and https://github.com/webcompat/web-bugs/issues/59509, but both may be different root cause.

### https://github.com/webcompat/web-bugs/issues/61014
This uses grid and flexbox. Also, this isn't scrollable content. 

### https://github.com/webcompat/web-bugs/issues/59509
APZ supports root layer to scroll content, but search box in github seems to be have another layer.

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