| <!doctype html> |
| <meta charset="utf-8"> |
| <title>CSS.supports</title> |
| <link rel="help" href="https://drafts.csswg.org/css-conditional/#dom-css-supports"> |
| <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"); |
| |
| test(function() { |
| assert_equals(CSS.supports("selector(div)"), true); |
| }, "selector() function accepts a selector"); |
| |
| test(function() { |
| assert_equals(CSS.supports("selector(div, div)"), false); |
| }, "selector() function doesn't accept a selector list"); |
| |
| test(function() { |
| assert_equals(CSS.supports("selector(::-webkit-unknown-pseudo-element)"), false); |
| }, "selector() function rejects unknown webkit pseudo-elements."); |
| |
| test(function() { |
| assert_equals(CSS.supports("selector(::before)"), true); |
| }, "selector() function accepts known pseudo-elements"); |
| |
| test(function() { |
| assert_equals(CSS.supports("selector(div + .c)"), true); |
| }, "selector() with simple combinators"); |
| |
| test(function() { |
| assert_equals(CSS.supports("selector(div | .c)"), false); |
| }, "selector() with unknown combinators"); |
| </script> |
