| <!doctype html> |
| <meta charset="utf-8"> |
| <title>CSS.supports() Level 3</title> |
| <link rel="help" href="https://www.w3.org/TR/css-conditional-3/#the-css-namespace"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| test(function() { |
| assert_equals(CSS.supports("color: red"), true); |
| }, "Single-argument form allows for declarations without enclosing parentheses"); |
| |
| test(function() { |
| assert_equals(CSS.supports("(color: red) and (color: blue)"), true); |
| }, "Complex conditions allowed"); |
| |
| test(function() { |
| assert_equals(CSS.supports("not (foobar)"), true); |
| }, "general_enclosed still parses"); |
| |
| test(function() { |
| assert_equals(CSS.supports("color: something-pointless var(--foo)"), true); |
| }, "Variable references always parse"); |
| |
| test(function() { |
| assert_equals(CSS.supports("color: something-pointless(var(--foo))"), true); |
| }, "Variable references in an unknown function always parse"); |
| |
| test(function() { |
| assert_equals(CSS.supports("color", "red"), true); |
| }, "two argument form succeeds for known property"); |
| |
| test(function() { |
| assert_equals(CSS.supports("unknownproperty", "blah"), false); |
| }, "two argument form fails for unknown property"); |
| |
| test(function() { |
| assert_equals(CSS.supports("width", "blah"), false); |
| }, "two argument form fails for invalid value"); |
| |
| test(function() { |
| assert_equals(CSS.supports("--foo", "blah"), true); |
| }, "two argument form succeeds for custom property"); |
| </script> |
