<!DOCTYPE html>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
--><html><head><title>CSS Test: Test a declaration for a custom property has an invalid value does not cause the @supports rule to fail to parse.</title>
<link href="mailto:cam@mcc.id.au" rel="author" title="Cameron McCormack">
<link href="http://www.w3.org/TR/css-variables-1/#defining-variables" rel="help">
<link href="support/color-green-ref.htm" rel="match">
<style>
body { color: red; }
@supports (--a: !) or (--a: a) {
  p { color: green; }
}
</style>
</head><body><p>This text must be green.</p>
</body></html>