| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <link id="media-sheet" rel="stylesheet" media="(min-width: 5000px)"> |
| <link id="alternate-sheet" rel="alternate stylesheet" title="alternate"> |
| <script> |
| var test = async_test("Check that adding a non-blocking stylesheet does not cause a full document recalc."); |
| |
| window.onload = () => { |
| document.body.offsetTop; |
| |
| test.step(() => { |
| assert_true(!!window.internals, "Test requires internals object for recalc count."); |
| }); |
| |
| test.step(() => { |
| document.querySelector("#media-sheet").href = "data:text/css,#x{color:pink}"; |
| assert_equals(internals.updateStyleAndReturnAffectedElementCount(), 0, "No style recalc adding sheet without matching rules."); |
| }); |
| |
| test.step(() => { |
| document.querySelector("#alternate-sheet").href = "data:text/css,*{color:pink}"; |
| assert_equals(internals.updateStyleAndReturnAffectedElementCount(), 0, "No style recalc adding alternate sheet."); |
| }); |
| |
| test.done(); |
| }; |
| </script> |
