Bug 228143

Summary:	AX: CSS outline clipping when elements are resized in CSS
Product:	WebKit	Reporter:	Dave House <davehouse>
Component:	Layout and Rendering	Assignee:	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:

https://codepen.io/iknowdavehouse/pen/wvdqdba

Comment 1 Radar WebKit Bug Importer 2021-07-21 02:27:29 PDT

<rdar://problem/80887280>

Comment 2 Sam Sneddon [:gsnedders] 2021-07-23 04:35:52 PDT

Some layout/paint invalidation bug?