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diff --git a/testing/web-platform/tests/infrastructure/assumptions/html-elements.html b/testing/web-platform/tests/infrastructure/assumptions/html-elements.html
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+<!doctype html>
+<title>HTML styles</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+#parent {
+  display: none;
+}
+
+div.b {
+  all: initial;
+  direction: initial;
+  unicode-bidi: isolate;
+  display: block;
+}
+
+div.c {
+  background: red;
+  background: initial;
+}
+
+span.b {
+  all: initial;
+  direction: initial;
+  unicode-bidi: initial;
+  display: inline;
+}
+</style>
+<div id="parent">
+  <div class="a"></div>
+  <div class="b"></div>
+  <div class="c"></div>
+  <span class="a"></span>
+  <span class="b"></span>
+  <p></p>
+  <ul>
+    <li>
+  </ul>
+  <ol>
+    <li>
+  </ol>
+  <table>
+    <tbody>
+      <tr>
+        <td>
+  </table>
+</div>
+<script>
+test(function() {
+  assert_true('all' in document.documentElement.style);
+}, "(pre-req for comparison tests) all CSS short-hand supported");
+
+test(function() {
+  assert_in_array(window.getComputedStyle(document.querySelector("div.c")).backgroundColor,
+                  ["rgba(0, 0, 0, 0)", "transparent"]);
+}, "(pre-req for comparison tests) initial CSS value supported");
+
+test(function() {
+  var a = document.querySelector("div.a");
+  var b = document.querySelector("div.b");
+
+  var a_styles = window.getComputedStyle(a);
+  var b_styles = window.getComputedStyle(b);
+
+  assert_equals(a_styles.length, b_styles.length, "Same properties on both div.a and div.b");
+
+  for (var i = 0; i < a_styles.length; i++) {
+    var property = a_styles[i];
+    assert_equals(property, b_styles[i], "Same property on div.a and div.b");
+    if (property !== "unicode-bidi") {
+      assert_equals(a_styles[property], b_styles[property], "Different value for " + property);
+    }
+  }
+}, "Compare CSS div definitions (only valid if pre-reqs pass)");
+
+test(function() {
+  var a = document.querySelector("span.a");
+  var b = document.querySelector("span.b");
+
+  var a_styles = window.getComputedStyle(a);
+  var b_styles = window.getComputedStyle(b);
+
+  assert_equals(a_styles.length, b_styles.length, "Same properties on both span.a and span.b");
+
+  for (var i = 0; i < a_styles.length; i++) {
+    var property = a_styles[i];
+    assert_equals(property, b_styles[i], "Same property on span.a and span.b");
+    assert_equals(a_styles[property], b_styles[property], "Different value for " + property);
+  }
+}, "Compare CSS span definitions (only valid if pre-reqs pass)");
+
+test(function() {
+  var p = document.getElementsByTagName("p")[0];
+  var styles = window.getComputedStyle(p);
+  assert_equals(styles["display"], "block");
+}, "p is display: block");
+
+test(function() {
+  var ul_li = document.querySelector("ul > li");
+  var styles = window.getComputedStyle(ul_li);
+  assert_equals(styles["display"], "list-item");
+}, "ul > li is display: list-item");
+
+test(function() {
+  var ol_li = document.querySelector("ol > li");
+  var styles = window.getComputedStyle(ol_li);
+  assert_equals(styles["display"], "list-item");
+}, "ol > li is display: list-item");
+
+test(function() {
+  var table = document.getElementsByTagName("table")[0];
+  var styles = window.getComputedStyle(table);
+  assert_equals(styles["display"], "table");
+}, "table is display: table");
+
+test(function() {
+  var tbody = document.getElementsByTagName("tbody")[0];
+  var styles = window.getComputedStyle(tbody);
+  assert_equals(styles["display"], "table-row-group");
+}, "tbody is display: table-row-group");
+
+test(function() {
+  var tr = document.getElementsByTagName("tr")[0];
+  var styles = window.getComputedStyle(tr);
+  assert_equals(styles["display"], "table-row");
+}, "tr is display: table-row");
+
+test(function() {
+  var td = document.getElementsByTagName("td")[0];
+  var styles = window.getComputedStyle(td);
+  assert_equals(styles["display"], "table-cell");
+}, "td is display: table-cell");
+</script>