| <!doctype html> |
| <meta charset="utf-8"> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <title>Scrollport is used rather than content rect to compute intersection ratio</title> |
| <link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez"> |
| <link rel="author" href="https://mozilla.org" title="Mozilla"> |
| <link rel="help" href="https://github.com/w3c/IntersectionObserver/issues/504"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| #root { |
| overflow: hidden; |
| position: relative; |
| box-sizing: border-box; |
| width: 100px; |
| height: 100px; |
| padding: 10px; |
| } |
| #target { |
| width: 100px; |
| height: 100px; |
| background-color: green; |
| /* Shift into the padding area */ |
| position: relative; |
| left: -10px; |
| top: -10px; |
| } |
| </style> |
| <div id="root"> |
| <div id="target"></div> |
| </div> |
| <script> |
| promise_test(async function(t) { |
| const target = document.getElementById("target"); |
| assert_true(!!target, "target exists"); |
| const root = document.getElementById("root"); |
| assert_true(!!root, "root exists"); |
| const entries = await new Promise(resolve => { |
| const observer = new IntersectionObserver(resolve, { root }); |
| observer.observe(target); |
| }); |
| assert_equals(entries.length, 1, "Should have one entry."); |
| assert_equals(entries[0].intersectionRatio, 1, "Should be completely visible."); |
| }); |
| </script> |
