layout/style/test/test_rules_out_of_sheets.html@deefc01c0e14
layout/style/test/test_rules_out_of_sheets.html
Thu, 15 Jan 2015 21:03:48 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 21:03:48 +0100
- branch
- TOR_BUG_9701
- changeset 11
- deefc01c0e14
- permissions
- -rw-r--r--
Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)
1 <!DOCTYPE HTML>
2 <html>
3 <!--
4 https://bugzilla.mozilla.org/show_bug.cgi?id=634373
5 -->
6 <head>
7 <title>Test for Bug 634373</title>
8 <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
9 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
10 </head>
11 <body>
12 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=634373">Mozilla Bug 634373</a>
13 <p id="display"></p>
14 <div id="content" style="display: none">
16 </div>
17 <pre id="test">
18 <script type="application/javascript">
20 /** Test for Bug 634373 **/
22 function make_rule_and_remove_sheet(text, getter) {
23 var style = document.createElement("style");
24 style.setAttribute("type", "text/css");
25 style.appendChild(document.createTextNode(text));
26 document.head.appendChild(style);
27 var result = style.sheet.cssRules[0];
28 if (getter) {
29 result = getter(result);
30 }
31 document.head.removeChild(style);
32 style = null;
33 SpecialPowers.DOMWindowUtils.garbageCollect();
34 return result;
35 }
37 var gDisplayCS = getComputedStyle(document.getElementById("display"), "");
39 function keep_rule_alive_by_matching(rule) {
40 // It's the caller's job to guarantee that the rule matches a p.
41 // This just causes a style flush, which in turn keeps the rule alive
42 // until the next style flush.
43 var color = gDisplayCS.color;
44 return rule;
45 }
47 function get_rule_and_child(rule) {
48 return [rule, rule.cssRules[0]];
49 }
51 function get_only_child(rule) {
52 return rule.cssRules[0];
53 }
55 var rule;
57 // In this case, the rule goes away immediately, so we're testing
58 // the DOM wrapper's handling of a null rule, rather than the rule's
59 // handling of a null sheet.
60 rule = make_rule_and_remove_sheet("p { color: blue }");
61 rule.style.color = "";
62 try {
63 rule.style.color = "fuchsia";
64 } catch(ex) {}
66 rule = make_rule_and_remove_sheet("p { color: blue }",
67 keep_rule_alive_by_matching);
68 try {
69 rule.style.color = "";
70 } catch(ex) {}
71 try {
72 rule.style.color = "fuchsia";
73 } catch(ex) {}
75 rule = make_rule_and_remove_sheet("@media screen { p { color: blue } }",
76 get_rule_and_child);
77 rule[1].style.color = "";
78 try {
79 rule[1].style.color = "fuchsia";
80 } catch(ex) {}
82 // In this case, the rule goes away immediately, so we're testing
83 // the DOM wrapper's handling of a null rule, rather than the rule's
84 // handling of a null sheet.
85 rule = make_rule_and_remove_sheet("@media screen { p { color: blue } }",
86 get_only_child);
87 rule.style.color = "";
88 try {
89 rule.style.color = "fuchsia";
90 } catch(ex) {}
92 rule = make_rule_and_remove_sheet("@media screen { p { color: blue } }",
93 function(rule) {
94 return keep_rule_alive_by_matching(
95 get_only_child(rule));
96 });
97 try {
98 rule.style.color = "";
99 } catch(ex) {}
100 try {
101 rule.style.color = "fuchsia";
102 } catch(ex) {}
104 rule = make_rule_and_remove_sheet("@keyframes a { from { color: blue } }");
105 rule.appendRule("from { color: fuchsia}");
106 rule.deleteRule("from");
107 rule.name = "b";
108 rule.cssRules[0].keyText = "50%";
110 ok(true, "didn't crash");
112 </script>
113 </pre>
114 </body>
115 </html>
