Bug 228143

Summary: AX: CSS outline clipping when elements are resized in CSS
Product: WebKit Reporter: Dave House <davehouse>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: Safari 14   
Hardware: Unspecified   
OS: macOS 10.15   

Description Dave House 2021-07-21 02:27:18 PDT
When an element such as a link has an outline defined in CSS (for example as a :focus state) and that element has also been resized through bolding or increasing the font size the outline seems to clip based on the original font size. If you zoom the browser 2-3 times it triggers some kind of repaint and the outline appears.

The only way I have managed to get an outline to render properly in Safari is to add `overflow: auto` to the element which seems to force the outline to render correctly.

Simplified test case here:

Comment 1 Radar WebKit Bug Importer 2021-07-21 02:27:29 PDT
Comment 2 Sam Sneddon [:gsnedders] 2021-07-23 04:35:52 PDT
Some layout/paint invalidation bug?