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diff --git a/dom/media/webvtt/test/reftest/vtt_reflow_display-ref.html b/dom/media/webvtt/test/reftest/vtt_reflow_display-ref.html
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index 0000000000..19f3208e6b
--- /dev/null
+++ b/dom/media/webvtt/test/reftest/vtt_reflow_display-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE HTML>
+<html>
+<link rel="stylesheet" href="vtt_reflow_display.css">
+<body>
+<div class="video-player">
+ <div class="video-layer">
+ <video id="v1" autoplay controls></video>
+ </div>
+</div>
+<script>
+/**
+ * Simply play and pause a video without any cues.
+ */
+async function testDisplayCueDuringFrequentReflowRef() {
+ const video = document.getElementById("v1");
+ video.src = "white.webm";
+ video.onplay = _ => {
+ video.onplay = null;
+ video.pause();
+ document.documentElement.removeAttribute('class');
+ }
+};
+
+window.addEventListener("MozReftestInvalidate",
+ testDisplayCueDuringFrequentReflowRef);
+</script>
+</body>
+</html>