layout/style/test/test_rules_out_of_sheets.html@7e26c7da4463 (annotated)
layout/style/test/test_rules_out_of_sheets.html
Wed, 31 Dec 2014 06:55:50 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:55:50 +0100
- changeset 2
- 7e26c7da4463
- permissions
- -rw-r--r--
Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2
| michael@0 | 1 | <!DOCTYPE HTML> |
| michael@0 | 2 | <html> |
| michael@0 | 3 | <!-- |
| michael@0 | 4 | https://bugzilla.mozilla.org/show_bug.cgi?id=634373 |
| michael@0 | 5 | --> |
| michael@0 | 6 | <head> |
| michael@0 | 7 | <title>Test for Bug 634373</title> |
| michael@0 | 8 | <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> |
| michael@0 | 9 | <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> |
| michael@0 | 10 | </head> |
| michael@0 | 11 | <body> |
| michael@0 | 12 | <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=634373">Mozilla Bug 634373</a> |
| michael@0 | 13 | <p id="display"></p> |
| michael@0 | 14 | <div id="content" style="display: none"> |
| michael@0 | 15 | |
| michael@0 | 16 | </div> |
| michael@0 | 17 | <pre id="test"> |
| michael@0 | 18 | <script type="application/javascript"> |
| michael@0 | 19 | |
| michael@0 | 20 | /** Test for Bug 634373 **/ |
| michael@0 | 21 | |
| michael@0 | 22 | function make_rule_and_remove_sheet(text, getter) { |
| michael@0 | 23 | var style = document.createElement("style"); |
| michael@0 | 24 | style.setAttribute("type", "text/css"); |
| michael@0 | 25 | style.appendChild(document.createTextNode(text)); |
| michael@0 | 26 | document.head.appendChild(style); |
| michael@0 | 27 | var result = style.sheet.cssRules[0]; |
| michael@0 | 28 | if (getter) { |
| michael@0 | 29 | result = getter(result); |
| michael@0 | 30 | } |
| michael@0 | 31 | document.head.removeChild(style); |
| michael@0 | 32 | style = null; |
| michael@0 | 33 | SpecialPowers.DOMWindowUtils.garbageCollect(); |
| michael@0 | 34 | return result; |
| michael@0 | 35 | } |
| michael@0 | 36 | |
| michael@0 | 37 | var gDisplayCS = getComputedStyle(document.getElementById("display"), ""); |
| michael@0 | 38 | |
| michael@0 | 39 | function keep_rule_alive_by_matching(rule) { |
| michael@0 | 40 | // It's the caller's job to guarantee that the rule matches a p. |
| michael@0 | 41 | // This just causes a style flush, which in turn keeps the rule alive |
| michael@0 | 42 | // until the next style flush. |
| michael@0 | 43 | var color = gDisplayCS.color; |
| michael@0 | 44 | return rule; |
| michael@0 | 45 | } |
| michael@0 | 46 | |
| michael@0 | 47 | function get_rule_and_child(rule) { |
| michael@0 | 48 | return [rule, rule.cssRules[0]]; |
| michael@0 | 49 | } |
| michael@0 | 50 | |
| michael@0 | 51 | function get_only_child(rule) { |
| michael@0 | 52 | return rule.cssRules[0]; |
| michael@0 | 53 | } |
| michael@0 | 54 | |
| michael@0 | 55 | var rule; |
| michael@0 | 56 | |
| michael@0 | 57 | // In this case, the rule goes away immediately, so we're testing |
| michael@0 | 58 | // the DOM wrapper's handling of a null rule, rather than the rule's |
| michael@0 | 59 | // handling of a null sheet. |
| michael@0 | 60 | rule = make_rule_and_remove_sheet("p { color: blue }"); |
| michael@0 | 61 | rule.style.color = ""; |
| michael@0 | 62 | try { |
| michael@0 | 63 | rule.style.color = "fuchsia"; |
| michael@0 | 64 | } catch(ex) {} |
| michael@0 | 65 | |
| michael@0 | 66 | rule = make_rule_and_remove_sheet("p { color: blue }", |
| michael@0 | 67 | keep_rule_alive_by_matching); |
| michael@0 | 68 | try { |
| michael@0 | 69 | rule.style.color = ""; |
| michael@0 | 70 | } catch(ex) {} |
| michael@0 | 71 | try { |
| michael@0 | 72 | rule.style.color = "fuchsia"; |
| michael@0 | 73 | } catch(ex) {} |
| michael@0 | 74 | |
| michael@0 | 75 | rule = make_rule_and_remove_sheet("@media screen { p { color: blue } }", |
| michael@0 | 76 | get_rule_and_child); |
| michael@0 | 77 | rule[1].style.color = ""; |
| michael@0 | 78 | try { |
| michael@0 | 79 | rule[1].style.color = "fuchsia"; |
| michael@0 | 80 | } catch(ex) {} |
| michael@0 | 81 | |
| michael@0 | 82 | // In this case, the rule goes away immediately, so we're testing |
| michael@0 | 83 | // the DOM wrapper's handling of a null rule, rather than the rule's |
| michael@0 | 84 | // handling of a null sheet. |
| michael@0 | 85 | rule = make_rule_and_remove_sheet("@media screen { p { color: blue } }", |
| michael@0 | 86 | get_only_child); |
| michael@0 | 87 | rule.style.color = ""; |
| michael@0 | 88 | try { |
| michael@0 | 89 | rule.style.color = "fuchsia"; |
| michael@0 | 90 | } catch(ex) {} |
| michael@0 | 91 | |
| michael@0 | 92 | rule = make_rule_and_remove_sheet("@media screen { p { color: blue } }", |
| michael@0 | 93 | function(rule) { |
| michael@0 | 94 | return keep_rule_alive_by_matching( |
| michael@0 | 95 | get_only_child(rule)); |
| michael@0 | 96 | }); |
| michael@0 | 97 | try { |
| michael@0 | 98 | rule.style.color = ""; |
| michael@0 | 99 | } catch(ex) {} |
| michael@0 | 100 | try { |
| michael@0 | 101 | rule.style.color = "fuchsia"; |
| michael@0 | 102 | } catch(ex) {} |
| michael@0 | 103 | |
| michael@0 | 104 | rule = make_rule_and_remove_sheet("@keyframes a { from { color: blue } }"); |
| michael@0 | 105 | rule.appendRule("from { color: fuchsia}"); |
| michael@0 | 106 | rule.deleteRule("from"); |
| michael@0 | 107 | rule.name = "b"; |
| michael@0 | 108 | rule.cssRules[0].keyText = "50%"; |
| michael@0 | 109 | |
| michael@0 | 110 | ok(true, "didn't crash"); |
| michael@0 | 111 | |
| michael@0 | 112 | </script> |
| michael@0 | 113 | </pre> |
| michael@0 | 114 | </body> |
| michael@0 | 115 | </html> |
