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chromium/third_party/blink/web_tests/external/wpt/css/css-device-adapt/viewport-user-scalable-no-wide-content.tentative.html 

<!doctype html>
<meta charset=utf-8>
<meta name="viewport" content="width=device-width, user-scalable=no">
<link rel="help" href="https://drafts.csswg.org/css-device-adapt/">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/5016">
<style>
body {
  margin: 0;
}
#content {
  width: 10000px;
  height: 10000px;
  background: green;
}
</style>

<div id="content">Content</div>

<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
'use strict';
test(() => {
  assert_equals(window.visualViewport.scale, 1.0,
    'visual viewport scale should be 1.0');
}, 'Page with meta viewport "width=device-width, user-scalable=no" ' +
   'should scale document with very wide content to 1.0.');
</script>