| <!doctype html> |
| <meta charset="utf-8"> |
| <title>CSSOM: getComputedStyle returns no style for elements not in the tree</title> |
| <link rel="help" href="https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle"> |
| <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> |
| <script src=/resources/testharness.js></script> |
| <script src=/resources/testharnessreport.js></script> |
| <div id="host"> |
| <div id="non-slotted"> |
| <div id="non-slotted-descendant"></div> |
| </div> |
| </div> |
| <iframe srcdoc="<html></html>" style="display: none"></iframe> |
| <script> |
| function testNoComputedStyle(element, description, global) { |
| test(function() { |
| assert_true(!!element); |
| let style = (global ? global : window).getComputedStyle(element); |
| assert_true(!!style); |
| assert_equals(style.length, 0); |
| assert_equals(style.color, ""); |
| }, `getComputedStyle returns no style for ${description}`); |
| } |
| |
| let detached = document.createElement('div'); |
| testNoComputedStyle(detached, "detached element"); |
| |
| testNoComputedStyle(document.querySelector('iframe').contentDocument.documentElement, |
| "element in non-rendered iframe (display: none)"); |
| |
| testNoComputedStyle(document.querySelector('iframe').contentDocument.documentElement, |
| "element in non-rendered iframe (display: none) from iframe's window", |
| document.querySelector('iframe').contentWindow); |
| |
| host.attachShadow({ mode: "open" }); |
| testNoComputedStyle(document.getElementById('non-slotted'), |
| "element outside the flat tree"); |
| |
| testNoComputedStyle(document.getElementById('non-slotted-descendant'), |
| "descendant outside the flat tree"); |
| |
| let shadowRoot = detached.attachShadow({ mode: "open" }); |
| shadowRoot.innerHTML = ` |
| <div id="detached-shadow-tree-descendant"></div> |
| `; |
| testNoComputedStyle(shadowRoot.getElementById('detached-shadow-tree-descendant'), |
| "shadow tree outside of flattened tree"); |
| </script> |
