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diff --git a/testing/web-platform/tests/custom-elements/v0/concepts/custom-elements-type-allowed-chars.html b/testing/web-platform/tests/custom-elements/v0/concepts/custom-elements-type-allowed-chars.html
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+++ b/testing/web-platform/tests/custom-elements/v0/concepts/custom-elements-type-allowed-chars.html
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+<!DOCTYPE html>
+<html>
+<head>
+<title>Chars allowed for custom element type </title>
+<meta name="author" title="Sergey G. Grekhov" href="mailto:sgrekhov@unipro.ru">
+<meta name="author" title="Aleksei Yu. Semenov" href="mailto:a.semenov@unipro.ru">
+<meta name="assert" content="The custom element type identifies a custom element interface and is a sequence of characters that must match the NCName production">
+<meta name="timeout" content="long">
+<link rel="help" href="https://dvcs.w3.org/hg/webcomponents/raw-file/default/spec/custom/index.html#concepts">
+<link rel="help" href="http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../testcommon.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+function composeName(charCode) {
+    return 'x-' + String.fromCharCode(charCode) + '-x' + charCode.toString(16);
+}
+
+// NCName definition from http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName
+// NCName     ::= (Letter | '_') (NCNameChar)*
+// NCNameChar ::= Letter | Digit | '.' | '-' | '_' | CombiningChar | Extender
+// Letter     ::= BaseChar | Ideographic
+
+test(function() {
+    baseCharsSingle.testEach(composeName, checkValidName);
+    baseCharsRanges.testEach(composeName, checkValidName);
+}, 'Registering valid custom element types with base char');
+
+test(function() {
+    ideographicCharsSingle.testEach(composeName, checkValidName);
+    ideographicCharsRanges.testEach(composeName, checkValidName);
+}, 'Registering valid custom element types with ideographic char');
+
+test(function() {
+    digitCharsRanges.testEach(composeName, checkValidName);
+}, 'Registering valid custom element types with digit chars');
+
+test(function() {
+    (new CharsArray(['.', '-', '_'])).testEach(composeName, checkValidName)
+}, 'Registering valid custom element types with characters \'.\', \'-\', \'_\'');
+
+test(function() {
+    combiningChars.testEach(composeName, checkValidName);
+}, 'Registering valid custom element types with combining char');
+
+test(function() {
+    extenderChars.testEach(composeName, checkValidName);
+}, 'Registering valid custom element types with extender char');
+</script>
+</body>
+</html>