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chromium/third_party/blink/web_tests/fast/css/pseudo-empty-adjacent-dynamic.html 

<!DOCTYPE html>
<script src="../../resources/js-test.js"></script>
<style>
:empty + div { background-color: green; }
</style>
<div id="empty">To be removed</div>
<div id="sibling">This text should be green</div>
<script>
description("Check that the sibling of an element that becomes :empty is properly recalculated");

var transparent = "rgba(0, 0, 0, 0)";
var green = "rgb(0, 128, 0)";

empty.offsetTop; // force recalc
empty.style.color = "red"; // force LocalStyleChange on #empty
empty.offsetTop; // force recalc

shouldBe("getComputedStyle(sibling, '').backgroundColor", "transparent");

empty.removeChild(empty.firstChild);
empty.offsetTop; // force recalc

shouldBe("getComputedStyle(sibling, '').backgroundColor", "green");
</script>