WebKit export of https://bugs.webkit.org/show_bug.cgi?id=248145 (#37043)
diff --git a/css/css-animations/animation-css-variable-in-keyframe-adjusted.html b/css/css-animations/animation-css-variable-in-keyframe-adjusted.html
new file mode 100644
index 0000000..f8e760c
--- /dev/null
+++ b/css/css-animations/animation-css-variable-in-keyframe-adjusted.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Animations: adjust value of CSS variable used in keyframes</title>
+<link rel="help" href="https://drafts.csswg.org/css-animations/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/testcommon.js"></script>
+<style>
+
+@keyframes anim {
+ from { margin-left: var(--margin-left) }
+ to { margin-left: calc(var(--margin-left) * 2) }
+}
+
+</style>
+<div id="log"></div>
+<script>
+
+test(t => {
+ const div = addDiv(t);
+ div.style.setProperty('--margin-left', '100px');
+
+ div.style.animation = 'anim 1s linear';
+ const animation = div.getAnimations()[0];
+ animation.currentTime = 500;
+
+ assert_equals(
+ getComputedStyle(div).marginLeft,
+ '150px',
+ 'Animated value before updating variable'
+ );
+
+ div.style.setProperty('--margin-left', '200px');
+
+ assert_equals(
+ getComputedStyle(div).marginLeft,
+ '300px',
+ 'Animated value after updating variable'
+ );
+}, 'Animations reflect changes to variables on element');
+
+test(t => {
+ const parentDiv = addDiv(t);
+ const div = addDiv(t);
+ parentDiv.appendChild(div);
+ parentDiv.style.setProperty('--margin-left', '100px');
+
+ div.style.animation = 'anim 1s linear';
+ const animation = div.getAnimations()[0];
+ animation.currentTime = 500;
+
+ assert_equals(
+ getComputedStyle(div).marginLeft,
+ '150px',
+ 'Animated value before updating variable'
+ );
+
+ parentDiv.style.setProperty('--margin-left', '200px');
+
+ assert_equals(
+ getComputedStyle(div).marginLeft,
+ '300px',
+ 'Animated value after updating variable'
+ );
+}, 'Animations reflect changes to variables on parent element');
+
+
+</script>
