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diff --git a/testing/web-platform/tests/css/css-writing-modes/text-combine-upright-parsing-invalid-001.html b/testing/web-platform/tests/css/css-writing-modes/text-combine-upright-parsing-invalid-001.html
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+++ b/testing/web-platform/tests/css/css-writing-modes/text-combine-upright-parsing-invalid-001.html
@@ -0,0 +1,168 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Writing Modes: parsing text-combine-upright with invalid values</title>
+<link rel="author" title="Masataka Yakura" href="http://google.com/+MasatakaYakura">
+<link rel="help" href="http://www.w3.org/TR/css-writing-modes-4/#text-combine-upright">
+<meta name="assert" content="text-combine-upright doesn't support undefined keywords and out-of-range integer, and numbers.">
+<meta name="flags" content="dom invalid">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+#invalid_foo {
+  text-decoration-upright: foo;
+}
+
+#invalid_all_none {
+  text-decoration-upright: all none;
+}
+
+#invalid_none_digits {
+  text-decoration-upright: none digits;
+}
+
+#invalid_digits_bar {
+  text-decoration-upright: digits bar;
+}
+
+#invalid_digits_4_none {
+  text-decoration-upright: digits 4 none;
+}
+
+#invalid_digits2 {
+  text-decoration-upright: digits2;
+}
+
+#invalid_digits_1 {
+  text-decoration-upright: digits 1;
+}
+
+#invalid_digits_positive5 {
+  text-decoration-upright: digits +5;
+}
+
+#invalid_digits_2_00 {
+  text-decoration-upright: digits 2.00;
+}
+
+#invalid_digits_2_e_0 {
+  text-decoration-upright: digits 2e0;
+}
+
+#invalid_digits_positive2_e_0 {
+  text-decoration-upright: digits +2e0;
+}
+
+#invalid_digits_3_e_positive0 {
+  text-decoration-upright: digits 3e+0;
+}
+
+#invalid_digits_3_e_negative0 {
+  text-decoration-upright: digits 3e-0;
+}
+
+#invalid_digits_positive4_e_positive0 {
+  text-decoration-upright: digits +4e+0;
+}
+
+#invalid_digits_positive4_e_negative0 {
+  text-decoration-upright: digits +4e-0;
+}
+</style>
+</head>
+<body>
+
+<div id="invalid_foo"></div>
+<div id="invalid_all_none"></div>
+<div id="invalid_none_digits"></div>
+<div id="invalid_digits_bar"></div>
+<div id="invalid_digits_4_none"></div>
+<div id="invalid_digits2"></div>
+<div id="invalid_digits_1"></div>
+<div id="invalid_digits_positive5"></div>
+<div id="invalid_digits_2_00"></div>
+<div id="invalid_digits_2_e_0"></div>
+<div id="invalid_digits_positive2_e_0"></div>
+<div id="invalid_digits_3_e_positive0"></div>
+<div id="invalid_digits_3_e_negative0"></div>
+<div id="invalid_digits_positive4_e_positive0"></div>
+<div id="invalid_digits_positive4_e_negative0"></div>
+
+<div id="log"></div>
+
+<script>
+var getComputedValueFor = function (id) {
+  var element = document.getElementById(id);
+  return window.getComputedStyle(element).textCombineUpright;
+};
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_foo'), 'none');
+}, 'Computed value for `text-combine-upright: foo` is `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_all_none'), 'none');
+}, 'Computed value for `text-combine-upright: all none` is `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_none_digits'), 'none');
+}, 'Computed value for `text-combine-upright: none digits` is `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_bar'), 'none');
+}, 'Computed value for `text-combine-upright: digits bar` is `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_4_none'), 'none');
+}, 'Computed value for `text-combine-upright: digits 4 none` is `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits2'), 'none');
+}, 'Computed value for `text-combine-upright: digits2` is `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_1'), 'none');
+}, 'Computed value for `text-combine-upright: digits 1` is `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_positive5'), 'none');
+}, 'Computed value for `text-combine-upright: digits +5` is `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_2_00'), 'none');
+}, 'Computed value for `text-combine-upright: digits 2.00` is `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_2_e_0'), 'none');
+  assert_not_equals(getComputedValueFor('invalid_digits_2_e_0'), 'digits 2');
+}, 'Computed value for `text-combine-upright: digits 2e0` is not `digits 2` but `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_positive2_e_0'), 'none');
+  assert_not_equals(getComputedValueFor('invalid_digits_positive2_e_0'), 'digits 2');
+}, 'Computed value for `text-combine-upright: digits +2e0` is not `digits 2` but `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_3_e_positive0'), 'none');
+  assert_not_equals(getComputedValueFor('invalid_digits_3_e_positive0'), 'digits 3');
+}, 'Computed value for `text-combine-upright: digits 3e+0` is not `digits 3` but `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_3_e_negative0'), 'none');
+  assert_not_equals(getComputedValueFor('invalid_digits_3_e_negative0'), 'digits 3');
+}, 'Computed value for `text-combine-upright: digits 3e-0` is not `digits 3` but `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_positive4_e_positive0'), 'none');
+  assert_not_equals(getComputedValueFor('invalid_digits_positive4_e_positive0'), 'digits 4');
+}, 'Computed value for `text-combine-upright: digits +4e+0` is not `digits 4` but `none`');
+
+test(function () {
+  assert_equals(getComputedValueFor('invalid_digits_positive4_e_negative0'), 'none');
+  assert_not_equals(getComputedValueFor('invalid_digits_positive4_e_negative0'), 'digits 4');
+}, 'Computed value for `text-combine-upright: digits +4e-0` is not `digits 4` but `none`');
+</script>
+</body>
+</html>
+\ No newline at end of file