Bug 314626 – [marker] Outside list marker hidden when descendant has overflow:hidden

• Status: NEW
• Component: Layout and Rendering

[Ahmad Saleem]

Hi Team,

While going through Blink's commit, I found another failing test case:

Test Case: https://software.hixie.ch/utilities/js/live-dom-viewer/?saved=14721

^ Safari Technology Preview 243 does not show bullet for second (inside to outside).

Another Test Case: https://jsfiddle.net/9m62ywt4/

Blink Commit: https://chromium.googlesource.com/chromium/src.git/+/f5099b7b47d627181b682a832d0e80f775d20eae

Thanks!

[Karl Dubost]

Created attachment 479710 [details]
testcase

[Karl Dubost]

Created attachment 479711 [details]
rendering in safari, firefox, chrome

[Karl Dubost]

Is it really about line-break or about the bullet not being displayed?

[Karl Dubost]

3.1 The ::marker Pseudo-Element
https://drafts.csswg.org/css-lists-3/#marker-pseudo

The marker box is generated by the ::marker pseudo-element of a list item **as the list item's first child**, 
before the ::before pseudo-element (if it exists on the element).

3.5 The list-style-position property — outside
https://drafts.csswg.org/css-lists-3/#list-style-position-property

If the list item is a block container: the marker box is a block container 
and **is placed outside the principal block box**; however, the position 
of the list-item marker adjacent to floats is undefined. 

CSS does not specify the precise location of the marker box or its position 
in the painting order,  but does require that it be placed on the inline-start side of the box, 
using the writing mode of the box indicated by marker-side. **The marker box is fixed 
with respect to the principal block box's border and does not scroll with the principal box's content.** 
A UA may hide the marker if the element's  overflow is other than visible. (This allowance may change in the future)

[Radar WebKit Bug Importer]

<rdar://problem/177413973>

[Karl Dubost]

Pull request: https://github.com/WebKit/WebKit/pull/65170

[Karl Dubost]

This partially solves the issue but not by redesigning the full set of issues related to markers. Closing the PR.