| <!DOCTYPE html> |
| <title>Sticky positioned element should be observable by getBoundingClientRect.</title> |
| <link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" /> |
| <meta name="assert" content="This test checks that sticky positioned element |
| should be observable by getBoundingClientRect." /> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| body { |
| margin: 0; |
| } |
| |
| .container { |
| overflow: scroll; |
| width: 200px; |
| height: 200px; |
| } |
| |
| .spacer { |
| height: 2000px; |
| } |
| |
| .box { |
| width: 100px; |
| height: 100px; |
| background-color: green; |
| top: 50px; |
| } |
| |
| .sticky { |
| position: sticky; |
| } |
| </style> |
| |
| <div id="scroller" class="container"> |
| <div id="sticky" class="sticky box"></div> |
| <div class="spacer"></div> |
| </div> |
| |
| <script> |
| test(() => { |
| var element = document.getElementById('sticky'); |
| assert_equals(element.getBoundingClientRect().top, 50); |
| document.getElementById('scroller').scrollTop = 100; |
| assert_equals(element.getBoundingClientRect().top, 50); |
| sticky.style.position = 'relative'; |
| assert_equals(element.getBoundingClientRect().top, -50); |
| sticky.style.position = 'sticky'; |
| assert_equals(element.getBoundingClientRect().top, 50); |
| }, 'sticky positioned element should be observable by getBoundingClientRect.'); |
| </script> |
| |
