| <!DOCTYPE html> |
| <title>Sticky positioned element should be observable by offsetTop and offsetLeft</title> |
| <link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" /> |
| <meta name="assert" content="This test checks that a sticky positioned element |
| should be observable by offsetTop/offsetLeft." /> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| body { |
| margin: 0; |
| } |
| |
| .container { |
| position: relative; /* Required for offsetTop/offsetLeft tests. */ |
| overflow: scroll; |
| width: 200px; |
| height: 200px; |
| } |
| |
| .spacer { |
| width: 2000px; |
| height: 2000px; |
| } |
| |
| .box { |
| width: 100px; |
| height: 100px; |
| background-color: green; |
| } |
| |
| .sticky { |
| position: sticky; |
| top: 50px; |
| left: 20px; |
| } |
| </style> |
| |
| <div id="scroller1" class="container"> |
| <div class="spacer"></div> |
| </div> |
| |
| <script> |
| test(() => { |
| var scroller = document.getElementById('scroller1'); |
| scroller.scrollTop = 100; |
| scroller.scrollLeft = 75; |
| |
| var sticky = document.createElement('div'); |
| sticky.className = 'sticky box'; |
| scroller.insertBefore(sticky, scroller.querySelector('.spacer')); |
| |
| assert_equals(sticky.offsetTop, scroller.scrollTop + 50); |
| assert_equals(sticky.offsetLeft, scroller.scrollLeft + 20); |
| }, 'offsetTop/offsetLeft should be correct for sticky after script insertion'); |
| </script> |
| |
| <div id="scroller2" class="container"> |
| <div id="sticky2" class="sticky box"></div> |
| <div class="spacer"></div> |
| </div> |
| |
| <script> |
| test(function() { |
| var scroller = document.getElementById('scroller2'); |
| var sticky = document.getElementById('sticky2'); |
| scroller.scrollTop = 100; |
| scroller.scrollLeft = 75; |
| |
| var div = document.createElement('div'); |
| div.style.height = '65px'; |
| scroller.insertBefore(div, sticky); |
| |
| assert_equals(sticky.offsetTop, scroller.scrollTop + 50); |
| assert_equals(sticky.offsetLeft, scroller.scrollLeft + 20); |
| }, 'offsetTop/offsetLeft should be correct for sticky after script-caused layout'); |
| </script> |
