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<!doctype html>
<meta charset="utf-8">
<title>CSSOM - CSS interface</title>
<link rel="help" href="https://drafts.csswg.org/cssom/#the-css.escape()-method">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function () {
// https://drafts.csswg.org/cssom/#dom-css-escape
// https://drafts.csswg.org/cssom/#serialize-an-identifier
assert_equals(CSS.escape("hello world"), "hello\\ world", "CSS.escape: spaces get escaped with backslashes");
assert_equals(CSS.escape("hello\0world"), "hello\u{FFFD}world", "CSS.escape: NULL get replaced with U+FFFD REPLACEMENT CHARACTER");
assert_equals(CSS.escape("hello0world"), "hello0world", "CSS.escape: Numbers within string preserved");
assert_equals(CSS.escape("hello\x10world"), "hello\\10 world", "CSS.escape: Values between \\x01 and \\x1f are unicode escaped");
assert_equals(CSS.escape("hello\\world"), "hello\\\\world", "CSS.escape: Backslashes get backslash-escaped");
assert_equals(CSS.escape("hello\u{1234}world"), "hello\u{1234}world", "CSS.escape: Code points greater than U+0080 are preserved");
assert_equals(CSS.escape("hello\x7Fworld"), "hello\\7f world", "CSS.escape: Some code points less than U+0080 are unicode-escaped");
assert_equals(CSS.escape("-"), "\\-", "CSS.escape: Single dash escaped");
assert_equals(CSS.escape("0foo"), "\\30 foo", "CSS.escape: Numbers at the beginning of an ident get unicode escaped");
assert_equals(CSS.escape("-0foo"), "-\\30 foo", "CSS.escape: Numbers at the beginning of an ident after single hyphen get unicode escaped");
assert_equals(CSS.escape("--0foo"), "--0foo", "CSS.escape: Numbers at the beginning of an ident after multiple hyphens do not get unicode escaped");
}, "CSS.escape");
test(function () {
// https://drafts.csswg.org/css-conditional/#dom-css-supports
// https://drafts.csswg.org/css-conditional/#typedef-supports-condition
assert_equals(CSS.supports("color: red"), true, "CSS.supports: Single-argument form allows for declarations without enclosing parentheses");
assert_equals(CSS.supports("(color: red) and (color: blue)"), true, "CSS.supports: Complex conditions allowed");
assert_equals(CSS.supports("not (foobar)"), true, "CSS.supports: general_enclosed still parses");
assert_equals(CSS.supports("color: something-pointless var(--foo)"), true, "Variable references always parse");
assert_equals(CSS.supports("color: something-pointless(var(--foo))"), true, "Variable references in an unknown function always parse");
}, "CSS.supports, one argument form");
test(function () {
// https://drafts.csswg.org/css-conditional/#dom-css-supports
// https://drafts.csswg.org/css-conditional/#dfn-support
assert_equals(CSS.supports("color", "red"), true, "CSS.supports: two argument form succeeds for known property");
assert_equals(CSS.supports("unknownproperty", "blah"), false, "CSS.supports: two argument form fails for unknown property");
assert_equals(CSS.supports("width", "blah"), false, "CSS.supports: two argument form fails for invalid value");
assert_equals(CSS.supports("--foo", "blah"), true, "CSS.supports: two argument form succeeds for custom property");
}, "CSS.supports, two argument form");
test(function () {
assert_equals(CSS.supports("selector(div)"), true, "CSS.supports: selector() function accepts a selector");
assert_equals(CSS.supports("selector(div, div)"), false, "CSS.supports: selector() function doesn't accept a selector list");
assert_equals(CSS.supports("selector(::-webkit-unknown-pseudo-element)"), false, "CSS.supports: selector() function rejects unknown webkit pseudo-elements.");
assert_equals(CSS.supports("selector(::before)"), true, "CSS.supports: selector() function accepts known pseudo-elements");
assert_equals(CSS.supports("selector(div + .c)"), true, "CSS.supports: selector() with simple combinators");
assert_equals(CSS.supports("selector(div | .c)"), false, "CSS.supports: selector() with unknown combinators");
}, "CSS.supports, selector function");
</script>
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