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chromium/third_party/blink/web_tests/fast/dom/shadow/offsetWidth-host-style-change.html 

<!DOCTYPE html>

<script src="../../../resources/js-test.js"></script>

<div id="host"></div>

<script>
description('offsetWidth of a fixed width element should cause a style recalc if host styles are invalid');

onload = function() {
    host = document.getElementById('host');
    shadowRoot = host.attachShadow({mode: 'open'});
    div = shadowRoot.appendChild(document.createElement('div'));
    div.style.width = '100px';
    shouldBe('div.offsetWidth', '100');
    host.style.display = 'none';
    shouldBe('div.offsetWidth', '0');
};
</script>