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Test Info:

<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<style>
.a + .b { color: green }
</style>
<div id="host">
<div>
<div>
<div id="a"></div><div id="b" class="b"></div>
</div>
</div>
</div>
<div style="content-visibility:hidden"></div>
<script>
host.attachShadow({mode:"open"});
document.body.offsetTop;
a.className = "a";
getComputedStyle(b).color;
</script>