2005461 - An element can anchor to its own pseudo-element

Status: RESOLVED FIXED

(Core :: CSS Parsing and Computation, defect)

Description

[Nicolas Chevobbe [:nchevobbe]]

Attachment: test_case.html

Steps to reproduce

1. Open attached test case
2. Hover the resizable item in the page

Expected results

Nothing

Actual results

The pink background element position changes, although there's nothing that should happen on hover

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Comment 1

[Nicolas Chevobbe [:nchevobbe]]

Attachment: screencast

Here's what I'm seeing on latest Nightly

Comment 2

[David Shin[:dshin]]

Hm, element being able to anchor to its pseudo-element does not seem right, whose position then depends on the originating element, does not seem right at all.

Comment 3

[David Shin[:dshin]]

Aside - I we generally use the term "chained" for a positioned element anchoring to an element that is also positioned, like .c anchoring to .b which in turn is anchoring to .a.

I think in this case we're looking at a positioned element anchoring to multiple anchors.

Comment 4

[Emilio Cobos Álvarez [:emilio]]

Yeah, that left: anchor(--anchor right, 0) seems invalid to me

Comment 5

[Emilio Cobos Álvarez [:emilio]]

Attachment: Bug 2005461 - Prevent anchoring a fixed pos to its own descendant. r=#anchor-pos

Will add a test if there's none.

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/e8702c723d3d
https://hg.mozilla.org/integration/autoland/rev/8be34607b2b8
Prevent anchoring a fixed pos to its own descendant. r=jwatt

Comment 7

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/56713 for changes under testing/web-platform/tests

Comment 8

[Norisz Fay [:noriszfay]]

https://hg.mozilla.org/mozilla-central/rev/8be34607b2b8

Comment 9

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Upstream PR merged by moz-wptsync-bot