diff --git a/includes/Sanitizer.php b/includes/Sanitizer.php
index 6a568c2d0cd..ec17a0895cf 100644
--- a/includes/Sanitizer.php
+++ b/includes/Sanitizer.php
@@ -383,7 +383,7 @@ class Sanitizer {
 				'h2', 'h3', 'h4', 'h5', 'h6', 'cite', 'code', 'em', 's',
 				'strike', 'strong', 'tt', 'var', 'div', 'center',
 				'blockquote', 'ol', 'ul', 'dl', 'table', 'caption', 'pre',
-				'ruby', 'rt', 'rb', 'rp', 'p', 'span', 'abbr', 'dfn',
+				'ruby', 'rb', 'rp', 'rt', 'rtc', 'p', 'span', 'abbr', 'dfn',
 				'kbd', 'samp', 'data', 'time', 'mark'
 			);
 			$htmlsingle = array(
@@ -1685,10 +1685,10 @@ class Sanitizer {
 			# http://www.whatwg.org/html/text-level-semantics.html#the-ruby-element
 			'ruby'       => $common,
 			# rbc
-			# rtc
 			'rb'         => $common,
-			'rt'         => $common, #array_merge( $common, array( 'rbspan' ) ),
 			'rp'         => $common,
+			'rt'         => $common, #array_merge( $common, array( 'rbspan' ) ),
+			'rtc'         => $common,
 
 			# MathML root element, where used for extensions
 			# 'title' may not be 100% valid here; it's XHTML
diff --git a/includes/parser/CoreParserFunctions.php b/includes/parser/CoreParserFunctions.php
index cde7a2d83ee..79c8ade65e8 100644
--- a/includes/parser/CoreParserFunctions.php
+++ b/includes/parser/CoreParserFunctions.php
@@ -378,7 +378,7 @@ class CoreParserFunctions {
 		// list of disallowed tags for DISPLAYTITLE
 		// these will be escaped even though they are allowed in normal wiki text
 		$bad = array( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'div', 'blockquote', 'ol', 'ul', 'li', 'hr',
-			'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rp', 'br' );
+			'table', 'tr', 'th', 'td', 'dl', 'dd', 'caption', 'p', 'ruby', 'rb', 'rt', 'rtc', 'rp', 'br' );
 
 		// disallow some styles that could be used to bypass $wgRestrictDisplayTitle
 		if ( $wgRestrictDisplayTitle ) {
diff --git a/tests/parser/parserTests.txt b/tests/parser/parserTests.txt
index e4d93242e4b..6097370612b 100644
--- a/tests/parser/parserTests.txt
+++ b/tests/parser/parserTests.txt
@@ -1087,7 +1087,7 @@ Non-html5 tags should be accepted
 </p>
 !! end
 
-## a,rtc not permitted
+## a not permitted
 ## i,b,br omitted
 !! test
 Text-level semantic html elements in wikitext
@@ -1109,7 +1109,7 @@ Text-level semantic html elements in wikitext
 <sub>text</sub>
 <u>text</u>
 <mark>text</mark>
-<ruby><rb>明日<rp>(</rp><rt>Ashita</rt><rp>)</rp></rb></ruby>
+<ruby><rb>明日</rb><rp>(</rp><rt>Ashita</rt><rp> </rp><rtc>あした</rtc><rp>)</rp></ruby>
 <bdi>text</bdi>
 <bdo>text</bdo>
 <span>text</span>
@@ -1132,7 +1132,7 @@ Text-level semantic html elements in wikitext
 <sub>text</sub>
 <u>text</u>
 <mark>text</mark>
-<ruby><rb>明日<rp>(</rp><rt>Ashita</rt><rp>)</rp></rb></ruby>
+<ruby><rb>明日</rb><rp>(</rp><rt>Ashita</rt><rp> </rp><rtc>あした</rtc><rp>)</rp></ruby>
 <bdi>text</bdi>
 <bdo>text</bdo>
 <span>text</span>
@@ -1140,6 +1140,46 @@ Text-level semantic html elements in wikitext
 </p>
 !! end
 
+# test cases taken from
+# http://www.w3.org/TR/html5/text-level-semantics.html#the-ruby-element
+!! test
+Ruby markup (W3C-style)
+!! wikitext
+; Mono-ruby for individual base characters
+: <ruby>日<rt>に</rt>本<rt>ほん</rt>語<rt>ご</rt></ruby>
+; Group ruby
+: <ruby>今日<rt>きょう</rt></ruby>
+; Jukugo ruby
+: <ruby>法<rb>華</rb><rb>経</rb><rt>ほ</rt><rt>け</rt><rt>きょう</rt></ruby>
+; Inline ruby
+: <ruby>東<rb>京</rb><rp>(</rp><rt>とう</rt><rt>きょう</rt><rp>)</rp></ruby>
+; Double-sided ruby
+: <ruby><rb>旧</rb><rb>金</rb><rb>山</rb><rt>jiù</rt><rt>jīn</rt><rt>shān</rt><rtc>San Francisco</rtc></ruby>
+
+<ruby>
+<rb>♥</rb><rtc><rt>Heart</rt></rtc><rtc lang=fr><rt>Cœur</rt></rtc>
+<rb>☘</rb><rtc><rt>Shamrock</rt></rtc><rtc lang=fr><rt>Trèfle</rt></rtc>
+<rb>✶</rb><rtc><rt>Star</rt></rtc><rtc lang=fr><rt>Étoile</rt></rtc>
+</ruby>
+!! html
+<dl><dt> Mono-ruby for individual base characters</dt>
+<dd> <ruby>日<rt>に</rt>本<rt>ほん</rt>語<rt>ご</rt></ruby></dd>
+<dt> Group ruby</dt>
+<dd> <ruby>今日<rt>きょう</rt></ruby></dd>
+<dt> Jukugo ruby</dt>
+<dd> <ruby>法<rb>華</rb><rb>経</rb><rt>ほ</rt><rt>け</rt><rt>きょう</rt></ruby></dd>
+<dt> Inline ruby</dt>
+<dd> <ruby>東<rb>京</rb><rp>(</rp><rt>とう</rt><rt>きょう</rt><rp>)</rp></ruby></dd>
+<dt> Double-sided ruby</dt>
+<dd> <ruby><rb>旧</rb><rb>金</rb><rb>山</rb><rt>jiù</rt><rt>jīn</rt><rt>shān</rt><rtc>San Francisco</rtc></ruby></dd></dl>
+<p><ruby>
+<rb>♥</rb><rtc><rt>Heart</rt></rtc><rtc lang="fr"><rt>Cœur</rt></rtc>
+<rb>☘</rb><rtc><rt>Shamrock</rt></rtc><rtc lang="fr"><rt>Trèfle</rt></rtc>
+<rb>✶</rb><rtc><rt>Star</rt></rtc><rtc lang="fr"><rt>Étoile</rt></rtc>
+</ruby>
+</p>
+!! end
+
 !! test
 Non-word characters don't terminate tag names (bug 17663, 40670, 52022)
 !! wikitext