testing/web-platform/tests/css/selectors/focus-visible-010.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4   <meta charset="utf-8" />
   5   <title>CSS Test (Selectors): Keyboard focus enables :focus-visible</title>
   6   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   7   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   8   <script src="/resources/testharness.js"></script>
   9   <script src="/resources/testharnessreport.js"></script>
  10   <style>
  11     :focus-visible {
  12       outline: darkgreen auto 5px;
  13     }
  14
  15     :focus:not(:focus-visible) {
  16       background-color: tomato;
  17       outline: 0;
  18     }
  19   </style>
  20 </head>
  21 <body>
  22   This test checks that any element focused programmatically on page load will have <code>:focus-visible</code> matching enabled.
  23   <ul id="instructions">
  24     <li>If the element that says "I will be focused automatically" has a red background, then the test result is FAILURE. If the element has a green outline, then the test result is SUCCESS.</li>
  25   </ul>
  26   <br />
  27   <div id="el" tabindex="-1">I will be focused automatically.</el>
  28   <script>
  29     window.addEventListener('load', () => {
  30       el.focus();
  31     });
  32
  33     async_test(function(t) {
  34       el.addEventListener("focus", t.step_func(function() {
  35         assert_equals(getComputedStyle(el).outlineColor, "rgb(0, 100, 0)");
  36         t.done();
  37       }));
  38     }, "Programmatic focus on page load bshould match :focus-visible");
  39   </script>
  40 </body>
  41 </html>