Correct setAttributeNS() validation context

And add more <div algorithm>.

Fixes #1417.

Author: annevk

dom.bs

@@ -7397,19 +7397,26 @@ namespace.</p>
  is <var>namespace</var> and <a for=Attr>local name</a> is <var>localName</var>.
 </dl>
 
+<div algorithm>
 <p>The <dfn method for=Element><code>hasAttributes()</code></dfn> method steps are to return false
 if <a>this</a>'s <a for=Element>attribute list</a> <a for=list>is empty</a>; otherwise true.
+</div>
 
+<div algorithm>
 <p>The <dfn attribute for=Element><code>attributes</code></dfn> getter steps are to return the
 associated {{NamedNodeMap}}.
+</div>
 
+<div algorithm>
 <p>The <dfn method for=Element><code>getAttributeNames()</code></dfn> method steps are to return the
 <a for=Attr>qualified names</a> of the <a>attributes</a> in <a>this</a>'s
 <a for=Element>attribute list</a>, in order; otherwise a new <a for=/>list</a>.
 
 <p class=note>These are not guaranteed to be unique.<!-- A theoretical getAttributeNamesNS() could
 return an array of unique two-value-arrays. -->
+</div>
 
+<div algorithm>
 <p>The <dfn method for=Element><code>getAttribute(<var>qualifiedName</var>)</code></dfn> method
 steps are:
 
@@ -7422,7 +7429,9 @@ steps are:
 
  <li><p>Return <var>attr</var>'s <a for=Attr>value</a>.
 </ol>
+</div>
 
+<div algorithm>
 <p>The
 <dfn method for=Element><code>getAttributeNS(<var>namespace</var>, <var>localName</var>)</code></dfn>
 method steps are:
@@ -7436,7 +7445,9 @@ method steps are:
 
  <li><p>Return <var>attr</var>'s <a for=Attr>value</a>.
 </ol>
+</div>
 
+<div algorithm>
 <p>The
 <dfn method for=Element><code>setAttribute(<var>qualifiedName</var>, <var>value</var>)</code></dfn>
 method steps are:
@@ -7472,15 +7483,17 @@ method steps are:
 
  <li><p><a lt="append an attribute">Append</a> <var>attribute</var> to <a>this</a>.
 </ol>
+</div>
 
+<div algorithm>
 <p>The
 <dfn method for=Element><code>setAttributeNS(<var>namespace</var>, <var>qualifiedName</var>, <var>value</var>)</code></dfn>
 method steps are:
 
 <ol>
  <li><p>Let (<var>namespace</var>, <var>prefix</var>, <var>localName</var>) be the result of
  [=validate and extract|validating and extracting=] <var>namespace</var> and
- <var>qualifiedName</var> given "<code>element</code>".
+ <var>qualifiedName</var> given "<code>attribute</code>".
 
  <li><p>Let <var>verifiedValue</var> be the result of calling
  <a>get trusted type compliant attribute value</a> with <var>localName</var>, <var>namespace</var>,
@@ -7489,17 +7502,23 @@ method steps are:
  <li><p><a>Set an attribute value</a> for <a>this</a> using <var>localName</var>,
  <var>verifiedValue</var>, <var>prefix</var>, and <var>namespace</var>.
 </ol>
+</div>
 
+<div algorithm>
 <p>The
 <dfn method for=Element><code>removeAttribute(<var>qualifiedName</var>)</code></dfn>
 method steps are to <a lt="remove an attribute by name">remove an attribute</a> given
 <var>qualifiedName</var> and <a>this</a>, and then return undefined.
+</div>
 
+<div algorithm>
 <p>The
 <dfn method for=Element><code>removeAttributeNS(<var>namespace</var>, <var>localName</var>)</code></dfn>
 method steps are to <a lt="remove an attribute by namespace and local name">remove an attribute</a>
 given <var>namespace</var>, <var>localName</var>, and <a>this</a>, and then return undefined.
+</div>
 
+<div algorithm>
 <p>The <dfn method for=Element><code>hasAttribute(<var>qualifiedName</var>)</code></dfn> method
 steps are:
 
@@ -7511,7 +7530,9 @@ steps are:
  <li><p>Return true if <a>this</a> <a lt="has an attribute">has</a> an <a>attribute</a> whose
  <a for=Attr>qualified name</a> is <var>qualifiedName</var>; otherwise false.
 </ol>
+</div>
 
+<div algorithm>
 <p>The
 <dfn method for=Element><code>toggleAttribute(<var>qualifiedName</var>, <var>force</var>)</code></dfn>
 method steps are:
@@ -7552,7 +7573,9 @@ method steps are:
 
  <li><p>Return true.
 </ol>
+</div>
 
+<div algorithm>
 <p>The
 <dfn method for=Element><code>hasAttributeNS(<var>namespace</var>, <var>localName</var>)</code></dfn>
 method steps are:
@@ -7564,24 +7587,32 @@ method steps are:
  <a for=Attr>namespace</a> is <var>namespace</var> and <a for=Attr>local name</a> is
  <var>localName</var>; otherwise false.
 </ol>
+</div>
 
 <hr>
 
+<div algorithm>
 <p>The <dfn method for=Element><code>getAttributeNode(<var>qualifiedName</var>)</code></dfn> method
 steps are to return the result of <a lt="get an attribute by name">getting an attribute</a> given
 <var>qualifiedName</var> and <a>this</a>.
+</div>
 
+<div algorithm>
 <p>The
 <dfn method for=Element><code>getAttributeNodeNS(<var>namespace</var>, <var>localName</var>)</code></dfn>
 method steps are to return the result of
 <a lt="get an attribute by namespace and local name">getting an attribute</a> given
 <var>namespace</var>, <var>localName</var>, and <a>this</a>.
+</div>
 
+<div algorithm=Element/setAttributeNode>
 <p>The <dfn method for=Element><code>setAttributeNode(<var>attr</var>)</code></dfn> and
 <dfn method for=Element><code>setAttributeNodeNS(<var>attr</var>)</code></dfn> methods steps are to
 return the result of <a lt="set an attribute">setting an attribute</a> given <var>attr</var> and
 <a>this</a>.
+</div>
 
+<div algorithm>
 <p>The <dfn method for=Element><code>removeAttributeNode(<var>attr</var>)</code></dfn> method steps
 are:
 
@@ -7593,6 +7624,7 @@ are:
 
  <li><p>Return <var>attr</var>.
 </ol>
+</div>
 
 <hr>