css/cssom-view/client-props-input.html

<!doctype html>
<title>client* on input / textarea</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view/#extension-to-the-element-interface">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1654769">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<style>
  input, textarea {
    -webkit-appearance: none;
    appearance: none;
    height: 200px;
    width: 300px;
    border-style: solid;
    border-width: 10px 20px;
    padding: 2px;
    box-sizing: content-box;
  }
  .block { display: block; }
</style>
<input>
<textarea></textarea>
<input class="block">
<textarea class="block"></textarea>
<script>
test(() => {
  for (let element of document.querySelectorAll("input, textarea")) {
    let description = `${element.nodeName} ${element.className}: `;
    assert_equals(element.clientWidth, 304, description + "clientWidth should be the padding box");
    assert_equals(element.clientHeight, 204, description + "clientHeight should be the padding box");
    assert_equals(element.clientTop, 10, description + "clientTop should include the border offset");
    assert_equals(element.clientLeft, 20, description + "clientLeft should include the border offset");
  }
}, "client* on input / textarea");
</script>