multiple-host-pseudos-in-compound.html

<!DOCTYPE html>
<script src="../../../resources/js-test.js"></script>
<div id="host">Should be green</div>
<script>
    description("Multiple :host(-context) pseudos in same compound.");

    host.attachShadow({mode: 'open'});

    [
        ":host:host-context(body)",
        ":host-context(:not(.nomatch)):host",
        ":host:host:host",
        ":host-context(body):host-context(html)",
        ":host(:not(.nomatch)):host"
    ].forEach((selector) => {
        host.shadowRoot.innerHTML = "<style>" + selector + "{color:green}</style><slot/>";
        shouldBeEqualToString("getComputedStyle(host).color", "rgb(0, 128, 0)");

        host.shadowRoot.innerHTML = "<style>" + selector + "::before" + "{color:green;content:'green'}</style><slot/>";
        shouldBeEqualToString("getComputedStyle(host, '::before').color", "rgb(0, 128, 0)");
    });

</script>

chromium/third_party/blink/web_tests/fast/dom/shadow/multiple-host-pseudos-in-compound.html