Add tests for animating CSS ::backdrop pseudo-element

nt1m · nt1m · commit b3958a2b7798 · 2021-09-07T17:23:35.000+02:00
diff --git a/css/css-pseudo/backdrop-animate-002-ref.html b/css/css-pseudo/backdrop-animate-002-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<dialog id="target">Dialog contents</dialog>
+<style>
+#target::backdrop {
+  opacity: 0.1;
+  background-color: green;
+}
+</style>
+<script>
+const target = document.getElementById("target");
+target.showModal();
+</script>
diff --git a/css/css-pseudo/backdrop-animate-002.html b/css/css-pseudo/backdrop-animate-002.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: A Web Animations on ::backdrop</title>
+<link rel="help" href="https://fullscreen.spec.whatwg.org/#::backdrop-pseudo-element">
+<link rel="match" href="backdrop-animate-002-ref.html">
+<dialog id="target">Dialog contents</dialog>
+<script>
+const target = document.getElementById("target");
+target.showModal();
+target.animate({
+  opacity: [0.1, 0.1],
+  backgroundColor: ["green", "green"]
+}, {
+  pseudoElement: "::backdrop",
+  duration: Infinity
+});
+</script>
diff --git a/css/css-pseudo/backdrop-animate.html b/css/css-pseudo/backdrop-animate.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Pseudo-Elements Test: ::backdrop & web animations</title>
+<link rel="help" href="https://fullscreen.spec.whatwg.org/#::backdrop-pseudo-element">
+<link rel="help" href="https://drafts.csswg.org/web-animations-1/">
+<meta name="assert" content="This test checks that ::backdrop can be animated with Web Animations." />
+<div id="log"></div>
+<dialog id="target">Dialog contents</dialog>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+const target = document.getElementById("target");
+target.showModal();
+
+test(function() {
+  const options = {
+    pseudoElement: "::backdrop",
+    duration: 2,
+    delay: -1,
+  };
+  const cs = getComputedStyle(target, "::backdrop");
+  const anim = target.animate([
+    {backgroundColor: "rgb(0, 100, 200)"},
+    {backgroundColor: "rgb(200, 0, 100)"},
+  ], options);
+  this.add_cleanup(() => anim.cancel());
+  assert_equals(cs.backgroundColor, "rgb(100, 50, 150)", "background-color");
+}, "'backgroundColor' animation");
+</script>
