<!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>