author Brad Werth <bwerth@mozilla.com>
Wed, 20 May 2020 15:15:07 +0000
changeset 591548 d4b281989ea6aded83371f294e56a3536424361d
permissions -rw-r--r--
Bug 1638773: Allow initial-scale clamping when user-scalable=no, add WPT. r=hiro, a=RyanVM This corrects the handling of user-scalable=no to first clamp scale (whether specified or default) between min and max scales, then applies the resulting value to initial-scale, min and max. Differential Revision: https://phabricator.services.mozilla.com/D76056

<!doctype html>
<meta charset=utf-8>
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=device-width, maximum-scale=1.0">
<link rel="help" href="https://drafts.csswg.org/css-device-adapt/">
<link rel="help" href="https://webcompat.com/issues/52856">
body {
  margin: 0;
#content {
  width: 100px;
  height: 100px;
  background: green;

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

<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></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, ' +
   'initial-scale=device-width, maximum-scale=1.0" ' +
   'should scale to 1.0.');