eliott/ladybird
1
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird synced 2026-05-05 06:32:30 +02:00
Code Issues Packages Projects Releases Wiki Activity

Tests: Add test for non-invertible transform animation fallback

Browse Source 
When a transform animation involves a non-invertible matrix (e.g. a
matrix3d with zero Z-scale), the spec requires falling back to discrete
interpolation. Currently we drop the transform entirely, producing
"none" at all progress values. A following commit will fix this.
This commit is contained in:
Andreas Kling
2026-03-21 09:32:59 -05:00
committed by Andreas Kling
parent 704269f664
commit fa0a7d4a4a
Notes: github-actions[bot] 2026-03-22 04:18:49 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/fa0a7d4a4a6
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8560
2 changed files with 27 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
Tests/LibWeb/Text/input/css/transform-non-invertible-discrete-fallback.html Normal file
View File

@@ -0,0 +1,25 @@
<!DOCTYPE html>
<div id="target" style="width: 100px; height: 100px;"></div>
<script src="../include.js"></script>
<script>
test(() => {
// matrix3d with a zero Z-scale produces a non-invertible (singular) matrix.
// Per spec, when one of the matrices for interpolation is non-invertible,
// the animation must fall back to discrete interpolation.
const anim = target.animate([
{ transform: "matrix3d(2,0,0,0, 0,2,0,0, 0,0,0,0, 0,0,0,1)" },
{ transform: "scale(1)" },
], 1000);
anim.pause();
// At progress < 0.5, discrete interpolation should use the "from" value.
anim.currentTime = 200;
const at02 = getComputedStyle(target).transform;
println("at 0.2: " + at02);
// At progress >= 0.5, discrete interpolation should use the "to" value.
anim.currentTime = 800;
const at08 = getComputedStyle(target).transform;
println("at 0.8: " + at08);
});
</script>