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+<!DOCTYPE html>
+<title>CSS Writing Modes: parsing text-orientation</title>
+<link rel="author" title="Koji Ishii" href="mailto:kojiishi@gmail.com">
+<link rel="help" href="https://drafts.csswg.org/css-writing-modes-3/#text-orientation">
+<meta name="assert" content="This test asserts the parser and getComputedStyle works correctly for the text-orientation property.">
+<meta name="flags" content="dom">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div
+  data-expected="mixed" title="text-orientation initial value"></div>
+
+<div style="text-orientation: upright"
+  data-expected="upright"></div>
+<div style="text-orientation: sideways"
+  data-expected="sideways"></div>
+
+<div style="text-orientation: upright">
+  <div
+    data-expected="upright" title="text-orientation should inherit"></div>
+
+  <div style="text-orientation: mixed"
+    data-expected="mixed"></div>
+
+  <div style="text-orientation: initial"
+    data-expected="mixed"></div>
+  <div style="text-orientation: inherit"
+    data-expected="upright"></div>
+
+  <div style="text-orientation: foo"
+    data-expected="upright"></div>
+</div>
+
+<script>
+Array.prototype.forEach.call(document.querySelectorAll("[data-expected]"), function (element) {
+  test(function () {
+    var actual = getComputedStyle(element).textOrientation;
+    assert_equals(actual, element.dataset.expected);
+  }, element.title || element.getAttribute("style"));
+});
+</script>