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chromium/third_party/blink/web_tests/external/wpt/css/css-grid/grid-model/grid-button-001.html 

<!DOCTYPE html>
<title>Grid items work inside a button</title>
<meta name="assert" content="When a button is set to display: grid, its children should flow into its grid cells">
<link rel="author" title="Bryan Robinson" href="[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
<style>
  .grid { display: grid; grid-template-columns: 100px 200px; border: 2px solid purple; box-sizing: border-box; }
  span { border: 1px dashed green; box-sizing: border-box; }
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>

<button class="grid" ><span class="item1" data-expected-width="100">item 1</span> <span class="item2" data-expected-width="200">item 2</span></button>

<script>
  checkLayout("[data-expected-width]")
</script>