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chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/file-selector-button-inherit.html 

<!doctype html>
<title>CSS Pseudo Test: ::file-selector-button inherits from its originating element</title>
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#treelike">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  input { background-color: green; }
  input::file-selector-button {
    color: green;
    background-color: inherit;
  }
</style>
<input id="inp" type="file">
<script>
  test(() => {
    const style = getComputedStyle(inp, "::file-selector-button");
    assert_equals(style.color, "rgb(0, 128, 0)", "Check that ::file-selector-button is supported via color");
    assert_equals(style.backgroundColor, "rgb(0, 128, 0)", "::file-selector-button inheriting background-color");
  }, "::file-selector-button should inherit from its originating element");
</script>