зеркало из https://github.com/mozilla/gecko-dev.git
116 строки
3.2 KiB
HTML
116 строки
3.2 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=634373
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-->
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<head>
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<title>Test for Bug 634373</title>
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<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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</head>
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<body>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=634373">Mozilla Bug 634373</a>
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<p id="display"></p>
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<div id="content" style="display: none">
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</div>
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<pre id="test">
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<script type="application/javascript">
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/** Test for Bug 634373 **/
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function make_rule_and_remove_sheet(text, getter) {
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var style = document.createElement("style");
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style.setAttribute("type", "text/css");
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style.appendChild(document.createTextNode(text));
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document.head.appendChild(style);
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var result = style.sheet.cssRules[0];
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if (getter) {
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result = getter(result);
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}
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document.head.removeChild(style);
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style = null;
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SpecialPowers.DOMWindowUtils.garbageCollect();
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return result;
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}
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var gDisplayCS = getComputedStyle(document.getElementById("display"), "");
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function keep_rule_alive_by_matching(rule) {
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// It's the caller's job to guarantee that the rule matches a p.
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// This just causes a style flush, which in turn keeps the rule alive
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// until the next style flush.
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var color = gDisplayCS.color;
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return rule;
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}
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function get_rule_and_child(rule) {
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return [rule, rule.cssRules[0]];
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}
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function get_only_child(rule) {
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return rule.cssRules[0];
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}
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var rule;
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// In this case, the rule goes away immediately, so we're testing
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// the DOM wrapper's handling of a null rule, rather than the rule's
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// handling of a null sheet.
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rule = make_rule_and_remove_sheet("p { color: blue }");
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rule.style.color = "";
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try {
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rule.style.color = "fuchsia";
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} catch(ex) {}
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rule = make_rule_and_remove_sheet("p { color: blue }",
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keep_rule_alive_by_matching);
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try {
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rule.style.color = "";
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} catch(ex) {}
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try {
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rule.style.color = "fuchsia";
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} catch(ex) {}
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rule = make_rule_and_remove_sheet("@media screen { p { color: blue } }",
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get_rule_and_child);
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rule[1].style.color = "";
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try {
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rule[1].style.color = "fuchsia";
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} catch(ex) {}
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// In this case, the rule goes away immediately, so we're testing
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// the DOM wrapper's handling of a null rule, rather than the rule's
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// handling of a null sheet.
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rule = make_rule_and_remove_sheet("@media screen { p { color: blue } }",
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get_only_child);
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rule.style.color = "";
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try {
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rule.style.color = "fuchsia";
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} catch(ex) {}
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rule = make_rule_and_remove_sheet("@media screen { p { color: blue } }",
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function(rule) {
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return keep_rule_alive_by_matching(
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get_only_child(rule));
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});
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try {
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rule.style.color = "";
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} catch(ex) {}
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try {
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rule.style.color = "fuchsia";
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} catch(ex) {}
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rule = make_rule_and_remove_sheet("@keyframes a { from { color: blue } }");
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rule.appendRule("from { color: fuchsia}");
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rule.deleteRule("from");
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rule.name = "b";
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rule.cssRules[0].keyText = "50%";
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ok(true, "didn't crash");
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</script>
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</pre>
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</body>
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</html>
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