| <!DOCTYPE html> |
| |
| <style> |
| .exists1, .exists2 { } |
| </style> |
| |
| <script src="../../resources/js-test.js"></script> |
| |
| <div id="target"></div> |
| |
| <script> |
| description("Test that adding and removing class names with no matching selector does not cause a style recalc"); |
| |
| var target = document.getElementById('target'); |
| |
| function testClass(oldClasses, newClasses, needsRecalc) |
| { |
| target.className = oldClasses; |
| document.body.offsetTop; |
| target.className = newClasses; |
| shouldBe("internals.updateStyleAndReturnAffectedElementCount()", needsRecalc ? '1' : '0'); |
| } |
| |
| testClass('', 'exists1', true); |
| testClass('exists1', '', true); |
| testClass('', 'not-exists', false); |
| testClass('not-exists', '', false); |
| testClass('exists1', 'exists2', true); |
| testClass('exists1 exists2', 'exists2 exists1', false); |
| testClass('exists1 exists1', 'exists1 exists1', false); |
| testClass('exists1 exists1', 'exists1 exists1 doesnt-exist', false); |
| testClass('exists1 exists1 doesnt-exist', 'exists1 exists1', false); |
| testClass('exists1 exists1 doesnt-exist', 'exists1 doesnt-exist exists1', false); |
| testClass('exists1 doesnt-exist exists2 doesnt-exist exists1', 'doesnt-exist doesnt-exist2 exists2 exists1 doesnt-exist exists1', false); |
| </script> |
