| <!DOCTYPE html> |
| <title>IntersectionObserver ratio with fractional bounds</title> |
| <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1278897"> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <style> |
| #container { |
| overflow: hidden; |
| width: 500px; |
| } |
| #target { |
| display: list-item; |
| padding: 16.1px; |
| background: rebeccapurple; |
| } |
| </style> |
| |
| <div id="container"> |
| <div id="list"> |
| <span id="target"></span> |
| </div> |
| </div> |
| |
| <script> |
| async_test(function(t) { |
| let target = document.getElementById("target"); |
| let list = document.getElementById("list"); |
| let observer = new IntersectionObserver(t.step_func_done(function(entries) { |
| assert_equals(entries.length, 1); |
| assert_equals(entries[0].intersectionRatio, 1); |
| assert_equals(entries[0].isIntersecting, true); |
| }), { root: list, threshold: 1 }); |
| observer.observe(target); |
| }); |
| </script> |
