1823257 - WPT css/css-masking/mask-image/mask-origin-2.html fails

Status: RESOLVED MOVED

(Core :: Layout, defect)

Description

[Daniel Holbert [:dholbert]]

WPT https://wpt.fyi/results/css/css-masking/mask-image/mask-origin-2.html fails, with the failure screenshot showing that the colorful box is mis-positioned by a few pixels in each axis.

Based on the failure screenshot, it looks like we're masking the border-box instead of the margin box, or something along those lines. (The testcase has margin: 1px 2px 3px 4px; and mask-origin: margin-box;, and at least for the first section, the purple square is visually mispositioned by 1px in the y-axis and off by 4px in the x-axis.)

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:alaskanemily, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 2

[Daniel Holbert [:dholbert]]

(In reply to Daniel Holbert [:dholbert] from comment #0)

Based on the failure screenshot, it looks like we're masking the border-box instead of the margin box, or something along those lines. (The testcase has [...] mask-origin: margin-box

I guess we don't support mask-origin:margin-box, actually. It looks like that value was removed from the spec:
https://drafts.fxtf.org/css-masking-1/#changes

The following changes were made since the 26 August 2014 Candidate Recommendation.
Remove margin-box as possible value from mask-origin and mask-clip.

So the test is wrong and needs to be fixed.

Comment 3

[James [:FormularSumo]]

https://github.com/web-platform-tests/wpt/issues/41166 I have opened an issue on the WPT repo to suggest removing this test.

Comment 4

[James [:FormularSumo]]

The test has now been removed, so I think this bug can be closed
https://github.com/web-platform-tests/wpt/pull/41279

https://wpt.fyi/results/css/css-masking/mask-image?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&view=interop&q=label%3Ainterop-2023-cssmasking (Firefox now passes all mask-image/ tests)

Comment 5

[Daniel Holbert [:dholbert]]

Thanks! Closing as MOVED to https://github.com/web-platform-tests/wpt/issues/41166 (and fixed by https://github.com/web-platform-tests/wpt/pull/41279 , hooray!)