<title>CSS Test: Test a failing custom property declaration in an @supports rule whose value contains a variable reference with fallback containing a top level "!important".</title>

<link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">

<link rel="help" href="http://www.w3.org/TR/css-variables-1/#syntax">

<link rel="match" href="support/color-green-ref.html">

body { color: red; }

@supports (--a: a) and (not (--a: var(--b,!important))) {

p { color: green; }

}

<p>This text must be green.</p>