| <!doctype html> |
| <title>CSS Shadow Parts - :host::part()</title> |
| <link rel="author" title="Mozilla" href="https://mozilla.org"> |
| <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> |
| <link rel="help" href="https://drafts.csswg.org/css-shadow-parts/#part"> |
| <link rel="help" href="https://drafts.csswg.org/css-scoping/#host-selector"> |
| <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1624968"> |
| <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=980506"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <div id="host"></div> |
| <script> |
| test(function() { |
| let host = document.getElementById("host"); |
| host.attachShadow({ mode: "open" }).innerHTML = ` |
| <style> |
| :host::part(mypart) { |
| color: lime; |
| } |
| :host(.tweak)::part(mypart) { |
| color: blue; |
| } |
| </style> |
| <div part="mypart"></div> |
| `; |
| |
| let part = host.shadowRoot.querySelector("[part]"); |
| |
| assert_equals( |
| window.getComputedStyle(part).color, |
| "rgb(0, 255, 0)", |
| ":host::part() works", |
| ); |
| |
| host.classList.add("tweak"); |
| |
| assert_equals( |
| window.getComputedStyle(part).color, |
| "rgb(0, 0, 255)", |
| ":host::part() invalidation works properly", |
| ); |
| }, ":host::part works"); |
| </script> |
