| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.csswg.org/mediaqueries-5/#prefers-color-scheme" /> |
| <script type="text/javascript" src="/resources/testharness.js"></script> |
| <script type="text/javascript" src="/resources/testharnessreport.js"></script> |
| <style id="testStyle"> </style> |
| <script> |
| var sheet = testStyle.sheet; |
| |
| function query_is_parseable(query) { |
| try { |
| sheet.insertRule("@media " + query + "{}", 0); |
| return sheet.cssRules.length == 1 && |
| sheet.cssRules[0].media.mediaText != "not all"; |
| } finally { |
| while (sheet.cssRules.length) |
| sheet.deleteRule(0); |
| } |
| } |
| |
| function query_should_be_parseable(query) { |
| test(() => { |
| assert_true(query_is_parseable(query)); |
| }, "Should be parseable: '" + query + "'"); |
| } |
| |
| function query_should_not_be_parseable(query) { |
| test(() => { |
| assert_false(query_is_parseable(query)); |
| }, "Should not be parseable: '" + query + "'"); |
| } |
| |
| query_should_be_parseable("(prefers-color-scheme)"); |
| query_should_be_parseable("(prefers-color-scheme: no-preference)"); |
| query_should_be_parseable("(prefers-color-scheme: light)"); |
| query_should_be_parseable("(prefers-color-scheme: dark)"); |
| |
| query_should_not_be_parseable("(prefers-color-scheme: 0)"); |
| query_should_not_be_parseable("(prefers-color-scheme: none)"); |
| query_should_not_be_parseable("(prefers-color-scheme: 10px)"); |
| query_should_not_be_parseable("(prefers-color-scheme: dark 0)"); |
| query_should_not_be_parseable("(prefers-color-scheme: dark light)"); |
| query_should_not_be_parseable("(prefers-color-scheme: light/dark)"); |
| |
| test(() => { |
| let booleanContext = window.matchMedia("(prefers-color-scheme)"); |
| let noPreference = window.matchMedia("(prefers-color-scheme: no-preference)"); |
| assert_equals(booleanContext.matches, !noPreference.matches); |
| }, "Check that no-preference evaluates to false in the boolean context"); |
| </script> |
