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chromium/third_party/blink/web_tests/fast/dom/shadow/all-in-shadow-tree.html 

<!DOCTYPE html>
<script src="../../../resources/js-test.js"></script>
<script src="resources/shadow-dom.js"></script>
<style>
.test { width: 100px; height: 100px; }
</style>
<div id="test1" class="test"></div>
<div id="test2" class="test"></div>
<script>
function insertIntoShadowRoot(id) {
  let element = document.getElementById(id);
  var shadowRoot = element.attachShadow({mode: 'open'});
  shadowRoot.innerHTML = '<div style="all: initial; display: block; width:100%; height: 100%; background: black"></div>';
  return element;
}
let test1 = insertIntoShadowRoot('test1');
let test2 = insertIntoShadowRoot('test2');

description('Test for issue 432257: Matched properties cache should work for all property.');
shouldBe('window.getComputedStyle(test1.shadowRoot.firstChild).width', '"100px"');
shouldBe('window.getComputedStyle(test2.shadowRoot.firstChild).width', '"100px"');
</script>