From aee072efe2f6c93a039697fc5340d64d0c0f36b7 Mon Sep 17 00:00:00 2001
From: Arlo Breault <abreault@wikimedia.org>
Date: Tue, 7 Jul 2015 09:47:35 -0700
Subject: [PATCH] Empty attribute syntax

 * The value is implicitly the empty string.
   http://www.w3.org/TR/html5/syntax.html#syntax-attribute-name

Bug: T54330
Change-Id: I8591ef209fb7337fb39ad6e45135942d074373bc
---
 includes/Sanitizer.php       |  7 ++++---
 tests/parser/parserTests.txt | 24 +++++++++++++++---------
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/includes/Sanitizer.php b/includes/Sanitizer.php
index 2340cd9449..8422d9a793 100644
--- a/includes/Sanitizer.php
+++ b/includes/Sanitizer.php
@@ -1276,9 +1276,10 @@ class Sanitizer {
 			# Double-quoted
 			return $set[3];
 		} elseif ( !isset( $set[2] ) ) {
-			# In XHTML, attributes must have a value.
-			# For 'reduced' form, return explicitly the attribute name here.
-			return $set[1];
+			# In XHTML, attributes must have a value so return an empty string.
+			# See "Empty attribute syntax",
+			# http://www.w3.org/TR/html5/syntax.html#syntax-attribute-name
+			return "";
 		} else {
 			throw new MWException( "Tag conditions not met. This should never happen and is a bug." );
 		}
diff --git a/tests/parser/parserTests.txt b/tests/parser/parserTests.txt
index 18d9aa85e0..70c8c0c979 100644
--- a/tests/parser/parserTests.txt
+++ b/tests/parser/parserTests.txt
@@ -7980,8 +7980,8 @@ Handling html with a br self-closing tag
 <br title=bar/>
 <br title=bar/ >
 !! html/php
-<p><br title="title" />
-<br title="title" />
+<p><br title="" />
+<br title="" />
 <br />
 <br title="bar" />
 <br title="bar" />
@@ -14628,13 +14628,19 @@ Attribute test: unquoted but illegal value (hash)
 </p>
 !! end
 
+# Parsoid does not serialize to empty attribute syntax,
+# so wt2wt and html2wt cases are skipped
 !! test
-Attribute test: no value
+Attribute test: no value (T54330)
+!! options
+parsoid=wt2html,html2html
 !! wikitext
 <font color>foo</font>
-!! html
-<p><font color="color">foo</font>
+!! html/php
+<p><font color="">foo</font>
 </p>
+!! html/parsoid
+<p><font color="">foo</font></p>
 !! end
 
 !! test
@@ -15165,7 +15171,7 @@ array (
   'width' => '200',
   'height' => '100',
   'depth' => '50',
-  'square' => 'square',
+  'square' => '',
 )
 </pre>
 
@@ -15213,7 +15219,7 @@ array (
   'width' => '200',
   'height' => '100',
   'depth' => '50',
-  'square' => 'square',
+  'square' => '',
 )
 </pre>
 <p>other stuff
@@ -15360,7 +15366,7 @@ Sanitizer: Validating that <meta> and <link> work, but only for Microdata
 	<link rel="stylesheet" itemprop="hello" href="{{SERVER}}">
 </div>
 !! html
-<div itemscope="itemscope">
+<div itemscope="">
 <p>	<meta itemprop="hello" content="world" />
 	&lt;meta http-equiv="refresh" content="5"&gt;
 	<meta itemprop="hello" content="5" />
@@ -19279,7 +19285,7 @@ Page status indicators: Weird syntaxes that are okay
 showindicators
 !! wikitext
 <indicator name="empty" />
-<indicator name></indicator>
+<indicator name="name"></indicator>
 !! html
 empty=
 name=
-- 
2.20.1