| <!DOCTYPE html> |
| <script src="../../../resources/testharness.js"></script> |
| <script src="../../../resources/testharnessreport.js"></script> |
| <style></style> |
| <div> |
| <div></div> |
| <div></div> |
| <div></div> |
| <div></div> |
| <div></div> |
| <div id="found"> |
| <div></div> |
| </div> |
| <span></span> |
| </div> |
| <div id="placeholderWrapper"> |
| <textarea placeholder="Placeholder text"></textarea> |
| </div> |
| <textarea placeholder="Placeholder text"></textarea> |
| <script> |
| test(() => { |
| assert_true(!!window.internals, "Tests require window.internals."); |
| }, "Test for prerequisites."); |
| |
| function applyRuleAndReturnAffectedElementCount(ruleString) { |
| document.body.offsetTop; |
| document.styleSheets[0].insertRule(ruleString, 0); |
| var recalcCount = internals.updateStyleAndReturnAffectedElementCount(); |
| document.styleSheets[0].removeRule(); |
| return recalcCount; |
| } |
| |
| test(() => { |
| assert_equals(applyRuleAndReturnAffectedElementCount( |
| "span { background: green }"), 1, |
| "Check that only the span is affected."); |
| }, "A style rule with a type selector should only invalidate elements with that type."); |
| |
| test(() => { |
| assert_equals(applyRuleAndReturnAffectedElementCount( |
| "#notfound div { background: red }"), 0, |
| "Check that none of divs are recalculated."); |
| }, "A type selector scoped in an unknown id should not invalidate any elements."); |
| |
| test(() => { |
| assert_equals(applyRuleAndReturnAffectedElementCount( |
| "#found div { background: red }"), 1, |
| "Check that only one of the divs is recalculated."); |
| }, "A type selector scoped by a known id should only invalidate descendants of the element with that id."); |
| |
| test(() => { |
| assert_equals(applyRuleAndReturnAffectedElementCount( |
| "::-webkit-input-placeholder { background: green }"), 2, |
| "Check that only custom pseudo elements are recalculated."); |
| }, "A style rule with a custom pseudo element should only invalidate custom pseudo elements."); |
| |
| test(() => { |
| assert_equals(applyRuleAndReturnAffectedElementCount( |
| "#notfound ::-webkit-input-placeholder { background: green }"), 0, |
| "Check that no elements are recalculated."); |
| }, "A custom pseudo element scoped in an unknown id should not invalidate any elements."); |
| |
| test(() => { |
| assert_equals(applyRuleAndReturnAffectedElementCount( |
| "#placeholderWrapper ::-webkit-input-placeholder { background: green }"), 1, |
| "Check that only the scoped custom pseudo element is recalculated."); |
| }, "A custom pseudo element scoped in a known id should only invalidate descendants of the element with that id."); |
| </script> |
