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<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<title>CSS Conditional Test: Custom Properties in @supports</title>
<meta name="assert"
content="Test passes if custom properties are supported and correctly detected in @supports,
or unsupported and correctly detected in @supports.">
<link rel="help" href="https://www.w3.org/TR/css3-conditional/#at-supports">
<link rel="help" href="https://www.w3.org/TR/css-variables-1/">
<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
<link rel="match" href="at-supports-001-ref.html">
<style>
div {
background: green;
height: 20px;
width: 100px;
}
body {
--badcolor: red;
--goodcolor: green;
}
div {
background: var(--badcolor);
}
@supports (--foo: whatever) {
.test1 { background: green; }
}
@supports (--foo: whatever !important) {
.test2 { background: var(--goodcolor); }
}
.test3 { background: green; }
@supports (--foo: whatever !bogus) {
.test3 { background: red; }
}
@supports (color: var(--anything) invalid-value) {
.test4 { background: green; }
}
.test5 { background: red; }
@supports not (--goodcolor: green) {
.test5 { background: green; }
}
.test5 { background: var(--goodcolor) }
</style>
<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
<div class="test1"></div>
<div class="test2"></div>
<div class="test3"></div>
<div class="test4"></div>
<div class="test5"></div>
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