<script>
internals.settings.setCSSVariablesEnabled(true);
</script>
<style>
.a {
    -webkit-var-a: -webkit-var(b);
    -webkit-var-b: red;
}
.b {
    -webkit-var-b: -webkit-var(a);
}
.c {
    -webkit-var-c: -webkit-var(a);
    color: -webkit-var(c);
}
</style>
<div id="a">
<div id="b">
<div id="c">
This test is successful if this text is black, and the test does not result in a crash.
</div>
</div>
</div>