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diff --git a/testing/web-platform/tests/css/css-paint-api/registered-property-invalidation-002.https.html b/testing/web-platform/tests/css/css-paint-api/registered-property-invalidation-002.https.html
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+++ b/testing/web-platform/tests/css/css-paint-api/registered-property-invalidation-002.https.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Registering a property causes invalidation for applied value</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-paint-api/">
+<link rel="match" href="parse-input-arguments-ref.html">
+<script src="/common/reftest-wait.js"></script>
+<script src="/common/worklet-reftest.js"></script>
+<body>
+<style>
+#target {
+  background: paint(geometry);
+  width: 100px;
+  height: 100px;
+  --length: 100px;
+}
+</style>
+<div id="target"></div>
+<script id="code" type="text/worklet">
+registerPaint('geometry', class {
+  static get inputProperties() { return ['--length']; }
+  paint(ctx, geom, styleMap) {
+    let value = styleMap.get('--length');
+    let pass = value.value === 100 && value.unit === 'px';
+    ctx.fillStyle = pass ? 'green' : 'red';
+    ctx.fillRect(0, 0, geom.width, geom.height);
+  }
+});
+</script>
+
+<script>
+  async function test() {
+    getComputedStyle(target);
+    let code = document.getElementById('code').textContent;
+    await importWorklet(CSS.paintWorklet, code);
+    await workletPainted();
+    CSS.registerProperty({
+      name: '--length',
+      syntax: '<length>',
+      initialValue: '0px',
+      inherits: false
+    });
+    await workletPainted();
+    takeScreenshot();
+  }
+
+  test();
+</script>
+</body>
+</html>
+
+