wpt/css/css-conditional/at-supports-selector-file-selector-button.html at master · web-platform-tests/wpt · GitHub

Name: wpt/css/css-conditional/at-supports-selector-file-selector-button.html at master · web-platform-tests/wpt · GitHub
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<!doctype html>
<html>
<head>
<title>CSS Test (Conditional Rules): In @supports, ::file-selector-button can be parsed successfully</title>
<linkrel="author" title="Tim Nguyen" href="https://github.com/nt1m">
<linkrel="help" href="https://drafts.csswg.org/css-conditional-3/#at-supports">
<linkrel="help" href="https://drafts.csswg.org/css-pseudo/#file-selector-button-pseudo">
<linkrel="match" href="at-supports-001-ref.html">
<style>
div {
background: red;
height:100px;
width:100px;
 }
@supports selector(input::file-selector-button) {
div { background-color:green; }
 }
</style>
</head>
<body>
<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
<div></div>
</body>
</html>