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Per spec, assinging an empty string to textContent or innerHTML should not trigger any mutation observers, and therefore should not trigger a stylesheet reparse, when the element is already empty. Since we need to apply some special handling to innerHTML and textContent assignments to <style> nodes, and therefore re-parse directly in the setter rather than in response to mutation observers, we need to special-case this scenario. MozReview-Commit-ID: KdOYFs8ayT7 --HG-- extra : rebase_source : 67b85174d08028c5200964800b657950aa2bffa2
59 lines
1.9 KiB
HTML
59 lines
1.9 KiB
HTML
<!doctype html>
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<html>
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<head>
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<meta charset=utf-8>
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<title>CSS Test: DOM modification re-parsing test</title>
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<link rel="help" href="https://drafts.csswg.org/cssom/">
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<link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
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<script src=/resources/testharness.js></script>
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<script src=/resources/testharnessreport.js></script>
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<style>div { min-width: 0px; }</style>
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<style id="style-element"></style>
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</head>
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<body>
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<div id="test-div"></div>
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<script type="text/javascript">
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var style = document.getElementById("style-element");
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var div = document.getElementById("test-div");
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function testProperty(prop) {
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// Assigning an empty string to textContent or innerHTML should trigger a
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// reparse only if the element is not empty.
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style.sheet.insertRule("#test-div { min-width: 42px; }");
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assert_equals(getComputedStyle(div).minWidth, "42px");
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style[prop] = "";
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assert_equals(getComputedStyle(div).minWidth, "42px");
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style[prop] = " ";
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assert_equals(getComputedStyle(div).minWidth, "0px");
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style.sheet.insertRule("#test-div { min-width: 42px; }");
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assert_equals(getComputedStyle(div).minWidth, "42px");
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style[prop] = "";
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assert_equals(getComputedStyle(div).minWidth, "0px");
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style.sheet.insertRule("#test-div { min-width: 42px; }");
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assert_equals(getComputedStyle(div).minWidth, "42px");
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style.appendChild(document.createTextNode(""));
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assert_equals(getComputedStyle(div).minWidth, "0px");
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style.sheet.insertRule("#test-div { min-width: 42px; }");
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assert_equals(getComputedStyle(div).minWidth, "42px");
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style[prop] = "";
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assert_equals(getComputedStyle(div).minWidth, "0px");
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}
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test(function() {
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testProperty("textContent");
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}, "style.textContent modification");
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test(function() {
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testProperty("innerHTML");
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}, "style.innerHTML modification");
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</script>
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</body>
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</html>
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