2 files changed, 41 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-scrollbars/scrollbar-color-dynamic-8-ref.html b/testing/web-platform/tests/css/css-scrollbars/scrollbar-color-dynamic-8-ref.html
new file mode 100644
index 0000000000..badc993852
--- /dev/null
+++ b/testing/web-platform/tests/css/css-scrollbars/scrollbar-color-dynamic-8-ref.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<style>
+  :root {
+    scrollbar-color: blue green;
+  }
+  body {
+    display: flex;
+    flex-wrap: wrap;
+    width: 200vw;
+    height: 200vh;
+  }
+</style>
diff --git a/testing/web-platform/tests/css/css-scrollbars/scrollbar-color-dynamic-8.tentative.html b/testing/web-platform/tests/css/css-scrollbars/scrollbar-color-dynamic-8.tentative.html
new file mode 100644
index 0000000000..4926fadaca
--- /dev/null
+++ b/testing/web-platform/tests/css/css-scrollbars/scrollbar-color-dynamic-8.tentative.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<html class="reftest-wait">
+<title>Dynamically set scrollbar-colors when starts ::-webkit-scrollbar and ensure scrollbars update</title>
+<link rel="author" title="Luke Warlow" href="mailto:lwarlow@igalia.com" />
+<link rel="help" href="https://drafts.csswg.org/css-scrollbars" />
+<link rel="match" href="scrollbar-color-dynamic-8-ref.html" />
+<script src="/common/reftest-wait.js"></script>
+<style>
+  :root::-webkit-scrollbar {
+    background: pink;
+  }
+  :root::-webkit-scrollbar-thumb {
+    background: orange;
+  }
+
+  body {
+    display: flex;
+    flex-wrap: wrap;
+    width: 200vw;
+    height: 200vh;
+  }
+</style>
+<script>
+  requestAnimationFrame(() => requestAnimationFrame(() => {
+    document.documentElement.style.scrollbarColor = 'blue green';
+
+    takeScreenshot();
+  }));
+</script>