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diff --git a/testing/web-platform/tests/appmanifest/display-member/display-member-media-feature-fullscreen-manual.html b/testing/web-platform/tests/appmanifest/display-member/display-member-media-feature-fullscreen-manual.html
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+++ b/testing/web-platform/tests/appmanifest/display-member/display-member-media-feature-fullscreen-manual.html
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+<!DOCTYPE html>
+<title>Test "fullscreen" value of display member + media feature</title>
+<link rel="help" href="https://w3c.github.io/manifest#display-member" />
+<link rel="help" href="https://w3c.github.io/manifest/#dom-displaymodetype-fullscreen" />
+<link rel="help" href="https://w3c.github.io/manifest/#the-display-mode-media-feature" />
+<link rel="manifest" href="resources/display-member-media-feature-fullscreen.webmanifest" />
+<script src="resources/display-member-media-feature-manual.js"></script>
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<h1>Testing support for "fullscreen" value of display member + media feature</h1>
+<style>
+ .fail {
+ background-color: red;
+ }
+
+ @media all and (display-mode: fullscreen) {
+ body {
+ background-color: green;
+ }
+ }
+</style>
+<script>
+const fullscreen = matchMedia("(display-mode: fullscreen)");
+
+fullscreen.onchange = () => {
+ if (fullscreen.matches) {
+ document.body.classList.remove("fail");
+ }
+}
+
+if (!fullscreen.matches) {
+ document.body.classList.add("fail");
+}
+</script>
+<p>
+ To pass, the background color must be green after installing.
+</p>