[gw] (2) Allow spellcheck='' to be set with no value as a shorthand f…

…or 'true'. This isn't compatible with what existing implementations do, so please let me know if this is a problem... (credit: avk) (bug 6652)

git-svn-id: http://svn.whatwg.org/webapps@2936 340c8d12-0b0e-0410-8428-c7bf67bfef74

index

@@ -47955,7 +47955,7 @@ at the first element with the given ID must be treated as if it was cloned and r
 
   <p>The <dfn id=attr-spellcheck title=attr-spellcheck><code>spellcheck</code></dfn>
   attribute is an <a href=#enumerated-attribute>enumerated attribute</a> whose keywords are
-  <code title="">true</code> and <code title="">false</code>. The <code title="">true</code> keyword map to the <i>true</i> state. The <code title="">false</code> keyword maps to the <i>false</i> state. In
+  the empty string, <code title="">true</code> and <code title="">false</code>. The empty string and the <code title="">true</code> keyword map to the <i>true</i> state. The <code title="">false</code> keyword maps to the <i>false</i> state. In
   addition, there is a third state, the <i>inherit</i> state, which is
   the <i>missing value default</i> (and the <i>invalid value
   default</i>).</p>

source

@@ -55884,8 +55884,8 @@ at the first element with the given ID must be treated as if it was cloned and r
 
   <p>The <dfn title="attr-spellcheck"><code>spellcheck</code></dfn>
   attribute is an <span>enumerated attribute</span> whose keywords are
-  <code title="">true</code> and <code
-  title="">false</code>. The <code
+  the empty string, <code title="">true</code> and <code
+  title="">false</code>. The empty string and the <code
   title="">true</code> keyword map to the <i>true</i> state. The <code
   title="">false</code> keyword maps to the <i>false</i> state. In
   addition, there is a third state, the <i>inherit</i> state, which is