File: display-override-member-media-feature-tabbed-manual.tentative.html

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<!DOCTYPE html>
<title>Test "tabbed" in display-override member + media feature</title>
<link rel="help" href="https://w3c.github.io/manifest#display-member" />
<link rel="help" href="https://www.w3.org/TR/mediaqueries-5/#display-modes" />
<link rel="help" href="https://w3c.github.io/manifest/#dom-displaymodetype-browser" />
<link rel="manifest" href="resources/display-override-member-media-feature-tabbed.webmanifest" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="resources/display-override-member-media-feature-manual.js"></script>
<h1>Test "tabbed" in display-override member + media feature</h1>
<style>
  .fail {
    background-color: red;
  }

  @media all and (display-mode: tabbed) {
    body {
      background-color: green;
    }
  }
</style>
<script>
const tabbed = matchMedia("(display-mode: tabbed)");

tabbed.onchange = () => {
  if (tabbed.matches) {
    document.body.classList.remove("fail");
  }
}

if (!tabbed.matches) {
  document.body.classList.add("fail");
}
</script>
<p>
  To pass, the background color must be green after installing.
</p>