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