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<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<title>CSS Conditional Test: Unknown Functional Notation as False in @supports</title>
<meta name="assert"
content="Test passes if unknown but grammatical functional notations are treated as false in @supports.">
<link rel="help" href="https://www.w3.org/TR/css3-conditional/#at-supports">
<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: 10px;
width: 100px;
}
div {
background: red;
}
@supports not unknown() {
.test1.bare { background: green; }
}
@supports (not (unknown())) {
.test1.wrapped { background: green; }
}
@supports not unknown(with stuff) {
.test2.bare { background: green; }
}
@supports (not (unknown(with stuff))) {
.test2.wrapped { background: green; }
}
@supports not unknown(!@#% { ... } more() @stuff [ ]) {
.test3.bare { background: green; }
}
@supports (not (unknown(!@#% { ... } more() @stuff [ ]))) {
.test3.wrapped { background: green; }
}
.test4, .test5 { background: green; }
@supports unknown() {
.test4.bare { background: red; }
}
@supports (unknown()) {
.test4.wrapped { background: red; }
}
@supports unknown(with stuff) {
.test5.bare { background: red; }
}
@supports (unknown(with stuff)) {
.test5.wrapped { background: red; }
}
</style>
<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
<div class="test1 bare"></div>
<div class="test2 bare"></div>
<div class="test3 bare"></div>
<div class="test4 bare"></div>
<div class="test5 bare"></div>
<div class="test1 wrapped"></div>
<div class="test2 wrapped"></div>
<div class="test3 wrapped"></div>
<div class="test4 wrapped"></div>
<div class="test5 wrapped"></div>
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