Editorial: rename interface to mixin

This renames interface to mixin where appropriate (without changing
URLs).

It also fixes a typo, adds a LICENSE resource, and does some general
cleanup.

LICENSE

@@ -0,0 +1,117 @@
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dom.bs

@@ -1381,35 +1381,30 @@ can be used to explore this matter in more detail.
 <dfn export id=concept-node>nodes</dfn>) <a>participate</a> in a <a>tree</a>, simply named the
 <dfn export id=concept-node-tree>node tree</dfn>.
 
-A <a>node tree</a> is constrained as
-follows, expressed as a relationship between the type of
-<a>node</a> and its allowed
-<a>children</a>:
+<p>A <a>node tree</a> is constrained as follows, expressed as a relationship between the type of
+<a>node</a> and its allowed <a>children</a>:
+
 <dl>
  <dt>{{Document}}
  <dd>
-  In <a>tree order</a>:
+  <p>In <a>tree order</a>:
   <ol>
-   <li>Zero or more nodes each of which is either
-   {{ProcessingInstruction}} or {{Comment}}.
-   <li>Optionally one {{DocumentType}} node.
-   <li>Zero or more nodes each of which is either
-   {{ProcessingInstruction}} or {{Comment}}.
-   <li>Optionally one {{Element}} node.
-   <li>Zero or more nodes each of which is either
-   {{ProcessingInstruction}} or {{Comment}}.
+   <li><p>Zero or more nodes each of which is {{ProcessingInstruction}} or {{Comment}}.
+   <li><p>Optionally one {{DocumentType}} node.
+   <li><p>Zero or more nodes each of which is {{ProcessingInstruction}} or {{Comment}}.
+   <li><p>Optionally one {{Element}} node.
+   <li><p>Zero or more nodes each of which is {{ProcessingInstruction}} or {{Comment}}.
   </ol>
  <dt>{{DocumentFragment}}
  <dt>{{ShadowRoot}}
  <dt>{{Element}}
- <dd>Zero or more nodes each of which is one of {{Element}},
- {{ProcessingInstruction}}, {{Comment}}, or
- {{Text}}.
+ <dd><p>Zero or more nodes each of which is {{Element}}, {{Text}}, {{ProcessingInstruction}}, or
+ {{Comment}}.
  <dt>{{DocumentType}}
  <dt>{{Text}}
  <dt>{{ProcessingInstruction}}
  <dt>{{Comment}}
- <dd>None.
+ <dd><p>None.
 </dl>
 <!--AttrExodus -->
 
@@ -1875,13 +1870,11 @@ steps:
 </ol>
 
 
-<h4 id=interface-nonelementparentnode>Interface {{NonElementParentNode}}</h4>
+<h4 id=interface-nonelementparentnode>Mixin {{NonElementParentNode}}</h4>
 
-<p class="note no-backref">The
-{{NonElementParentNode/getElementById()}} method is not
-on <a for="/">elements</a> for compatibility with older versions of
-jQuery. If a time comes where that version of jQuery has disappeared, we might be able to
-support it.
+<p class="note no-backref">The {{NonElementParentNode/getElementById()}} method is not on
+<a for="/">elements</a> for compatibility with older versions of jQuery. If a time comes where that
+version of jQuery has disappeared, we might be able to support it.
 
 <pre class=idl>
 [NoInterfaceObject,
@@ -1895,21 +1888,17 @@ DocumentFragment implements NonElementParentNode;
 
 <dl class=domintro>
  <dt><code><var>node</var> . <a method for=NonElementParentNode lt="getElementById()">getElementById</a>(<var>elementId</var>)</code>
- <dd>Returns the first <a for="/">element</a> within
- <var>node</var>'s <a>descendants</a> whose
+ <dd><p>Returns the first <a for="/">element</a> within <var>node</var>'s <a>descendants</a> whose
  <a>ID</a> is <var>elementId</var>.
 </dl>
 
-The
-<dfn method for=NonElementParentNode>getElementById(<var>elementId</var>)</dfn>
-method must return the first <a for="/">element</a>, in
-<a>tree order</a>, within <a>context object</a>'s
-<a>descendants</a>, whose
-<a>ID</a> is <var>elementId</var>, and null if there is no
-such <a for="/">element</a> otherwise.
+<p>The <dfn method for=NonElementParentNode><code>getElementById(<var>elementId</var>)</code></dfn>
+method, when invoked, must return the first <a for="/">element</a>, in <a>tree order</a>, within
+<a>context object</a>'s <a>descendants</a>, whose <a>ID</a> is <var>elementId</var>, and null if
+there is no such <a for="/">element</a> otherwise.
 
 
-<h4 id="interface-parentnode">Interface {{ParentNode}}</h4>
+<h4 id=interface-parentnode>Mixin {{ParentNode}}</h4>
 
 To
 <dfn export lt="converting nodes into a node">convert <var>nodes</var> into a node</dfn>,
@@ -2078,12 +2067,11 @@ running <a>scope-match a selectors string</a> <var>selectors</var> against the
 <a>context object</a>.
 
 
-<h4 id=interface-nondocumenttypechildnode>Interface {{NonDocumentTypeChildNode}}</h4>
+<h4 id=interface-nondocumenttypechildnode>Mixin {{NonDocumentTypeChildNode}}</h4>
 
-<p class="note no-backref">The {{previousElementSibling}} and {{nextElementSibling}}
-attributes have been removed from {{DocumentType}} nodes for compatibility
-reasons. If these additions are deemed compatible enough in the future, they could be
-reinstated.
+<p class="note no-backref">The {{previousElementSibling}} and {{nextElementSibling}} attributes have
+been removed from {{DocumentType}} nodes for compatibility reasons. If these additions are deemed
+compatible enough in the future, they could be reinstated.
 
 <pre class=idl>
 [NoInterfaceObject,
@@ -2119,7 +2107,7 @@ attribute must return the first <a>following</a> <a>sibling</a> that is an <a fo
 and null otherwise.
 
 
-<h4 id=interface-childnode>Interface {{ChildNode}}</h4>
+<h4 id=interface-childnode>Mixin {{ChildNode}}</h4>
 
 <pre class=idl>
 [NoInterfaceObject,
@@ -5620,7 +5608,7 @@ invoked, must run these steps:
  "<code>section</code>", or
  "<code>span</code>", then throw a {{NotSupportedError}} exception.
 
- <li><p>If <a>context object</a>'s <a for=Element>shadow root</a> is non-null, then throw a
+ <li><p>If <a>context object</a>'s <a for=Element>shadow root</a> is non-null, then throw an
  {{InvalidStateError}} exception.
 
  <li><p>Let <var>shadow</var> be a new <a for=/>shadow root</a> whose <a>node document</a> is