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diff --git a/testing/web-platform/tests/html/semantics/tabular-data/attributes-common-to-td-and-th-elements/cellIndex.html b/testing/web-platform/tests/html/semantics/tabular-data/attributes-common-to-td-and-th-elements/cellIndex.html
new file mode 100644
index 0000000000..b8449229d5
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/tabular-data/attributes-common-to-td-and-th-elements/cellIndex.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>HTMLTableCellElement.cellIndex</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(function() {
+  var th = document.createElement("th");
+  assert_true("cellIndex" in th, '"cellIndex" in th');
+  var td = document.createElement("td");
+  assert_true("cellIndex" in td, '"cellIndex" in td');
+}, "cellIndex should exist.")
+test(function() {
+  var th = document.createElement("th");
+  assert_equals(th.cellIndex, -1);
+  var td = document.createElement("td");
+  assert_equals(td.cellIndex, -1);
+}, "For cells without a parent, cellIndex should be -1.")
+test(function() {
+  var table = document.createElement("table");
+  var th = table.appendChild(document.createElement("th"));
+  assert_equals(th.cellIndex, -1);
+  var td = table.appendChild(document.createElement("td"));
+  assert_equals(td.cellIndex, -1);
+}, "For cells whose parent is not a tr, cellIndex should be -1.")
+test(function() {
+  var tr = document.createElementNS("", "tr");
+  var th = tr.appendChild(document.createElement("th"));
+  assert_equals(th.cellIndex, -1);
+  var td = tr.appendChild(document.createElement("td"));
+  assert_equals(td.cellIndex, -1);
+}, "For cells whose parent is not a HTML tr, cellIndex should be -1.")
+test(function() {
+  var tr = document.createElement("tr");
+  var th = tr.appendChild(document.createElement("th"));
+  assert_equals(th.cellIndex, 0);
+  var td = tr.appendChild(document.createElement("td"));
+  assert_equals(td.cellIndex, 1);
+}, "For cells whose parent is a tr, cellIndex should be the index.")
+test(function() {
+  var tr = document.createElement("tr");
+  var th = tr.appendChild(document.createElement("th"));
+  assert_equals(th.cellIndex, 0);
+  tr.appendChild(document.createElement("div"));
+  tr.appendChild(document.createTextNode("Hello World"));
+  var td = tr.appendChild(document.createElement("td"));
+  assert_equals(td.cellIndex, 1)
+}, "For cells whose parent is a tr with non td/th sibling, cellIndex should skip those non td/th siblings.")
+</script>