1838085 - WPT css/css-transforms/transform-input-009.html fails in Firefox, due to being fuzzier in Firefox than the test's fuzzy annotation allows for

Status: RESOLVED FIXED

(Core :: Layout: Form Controls, defect)

Description

[Daniel Holbert [:dholbert]]

We fail this WPT:
https://wpt.fyi/results/css/css-transforms/transform-input-009.html

It seems to be a subtle antialiasing (and/or <1px positioning issue) for the text inside of the text fields.

It affects nearly every character, so there are lots of differing pixels. But that seems to be the case in other browsers, too -- the test already has this fuzzy annotation:

    <meta name="fuzzy" content="maxDifference=0-129;totalPixels=0-1340">

Our failure is a little less than 50% higher in both metrics there; our maxDifference is 166 and our totalPixels is 1895. Need to do a bit more digging to find out if we should just adjust those fuzzy metrics, or if there's a better mitigation we could do (e.g. maybe Ahem would improve things), or if there's actually a bug that needs fixing on our end.

Comment 1

[Boris Chiou [:boris]]

Attachment: Bug 1838085 - Use Ahem and remove fuzzy tolerance for transform-input-009.html.

Use Ahem font to reduce the amount of antialiasing, so we can try to remove
the fuzzy annotation from this test file.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/ebe7c3e8c3bf
Use Ahem and remove fuzzy tolerance for transform-input-009.html. r=dholbert

Comment 3

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

Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/41619 for changes under testing/web-platform/tests

Comment 4

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/ebe7c3e8c3bf

Comment 5

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

Upstream PR merged by moz-wptsync-bot