[cssom] Move styleSheets to DocumentOrShadowRoot.

Fixes w3c#548

Author: emilio

cssom-1/Overview.bs

@@ -114,6 +114,7 @@ spec:css-position-3; type:property; text:left
 spec:html; type:element; text:style
 spec:css-namespaces-3; type:dfn; text:namespace prefix
 spec:dom; type:interface; text:Document
+spec:dom; type:interface; text:DocumentOrShadowRoot
 spec:html; type:dfn; text:ascii case-insensitive
 spec:html; type:dfn; text:case-sensitive
 spec:infra; type:dfn; text:list
@@ -944,14 +945,14 @@ CSS Style Sheet Collections {#css-style-sheet-collections}
 ----------------------------------------------------------
 
 Below various new concepts are defined that are associated with each
-{{Document}} object.
+{{DocumentOrShadowRoot}} object.
 
-Each {{Document}} has an associated list of zero or more
+Each {{DocumentOrShadowRoot}} has an associated list of zero or more
 <a>CSS style sheets</a>, named the
-<dfn export for=Document>document CSS style sheets</dfn>. This is
+<dfn export for=DocumentOrShadowRoot>document or shadow root CSS style sheets</dfn>. This is
 an ordered list that contains all
 <a>CSS style sheets</a> associated with the
-{{Document}}, in
+{{DocumentOrShadowRoot}}, in
 <a>tree order</a>, with
 <a>CSS style sheets</a> created from HTTP
 <code>Link</code> headers first, if any, in header
@@ -976,7 +977,7 @@ steps:
 
 <ol>
  <li>Add the <a>CSS style sheet</a> to the list of
- <a>document CSS style sheets</a> at the appropriate location. The
+ <a>document or shadow root CSS style sheets</a> at the appropriate location. The
  remainder of these steps deal with the
  <a>disabled flag</a>.
 
@@ -1010,7 +1011,7 @@ steps:
 To <dfn export>remove a CSS style sheet</dfn>, run these steps:
 
 <ol>
- <li>Remove the <a>CSS style sheet</a> from the list of <a>document CSS style sheets</a>.
+ <li>Remove the <a>CSS style sheet</a> from the list of <a>document or shadow root CSS style sheets</a>.
 
  <li>Set the <a>CSS style sheet</a>'s <a for=CSSStyleSheet>parent CSS style sheet</a>,
  <a for=CSSStyleSheet>owner node</a> and <a for=CSSStyleSheet>owner CSS rule</a> to null.
@@ -1021,14 +1022,14 @@ To <dfn export>remove a CSS style sheet</dfn>, run these steps:
 </ol>
 
 A <dfn export>persistent CSS style sheet</dfn> is a
-<a>CSS style sheet</a> from the <a>document CSS style sheets</a>
+<a>CSS style sheet</a> from the <a>document or shadow root CSS style sheets</a>
 whose <a>title</a> is the empty string and whose
 <a>alternate flag</a> is unset.
 
 A <dfn export>CSS style sheet set</dfn> is an ordered
 collection of one or more <a>CSS style sheets</a>
-from the <a>document CSS style sheets</a> which have an identical
-<a>title</a> that is not the empty string.
+from the <a>document or shadow root CSS style sheets</a>
+which have an identical <a>title</a> that is not the empty string.
 
 A <dfn export>CSS style sheet set name</dfn> is the
 <a>title</a> the <a>CSS style sheet set</a> has in
@@ -1138,17 +1139,16 @@ sheet</a> in the collection. If there is no <var>index</var>th object in the col
 The <dfn attribute for=StyleSheetList>length</dfn> attribute must return the number of <a>CSS style sheets</a>
 represented by the collection.
 
-### Extensions to the {{Document}} Interface ### {#extensions-to-the-document-interface}
+### Extensions to the {{DocumentOrShadowRoot}} Interface ### {#extensions-to-the-document-or-shadow-root-interface}
 
 <pre class=idl>
-partial interface Document {
+partial interface DocumentOrShadowRoot {
   [SameObject] readonly attribute StyleSheetList styleSheets;
 };
 </pre>
 
-The <dfn attribute for=Document>styleSheets</dfn> attribute must return a {{StyleSheetList}} collection representing
-the <a>document CSS style sheets</a>.
-
+The <dfn attribute for=DocumentOrShadowRoot>styleSheets</dfn> attribute must return a {{StyleSheetList}} collection representing
+the <a>document or shadow root CSS style sheets</a>.
 
 Style Sheet Association {#style-sheet-association}
 --------------------------------------------------
@@ -1196,7 +1196,7 @@ To <dfn export>fetch a CSS style sheet</dfn> with parsed URL <var>parsed URL</va
 ### The {{LinkStyle}} Interface ### {#the-linkstyle-interface}
 
 The <dfn export>associated CSS style sheet</dfn> of a node is the <a>CSS style sheet</a> in the list of
-<a>document CSS style sheets</a> of which the <a for=CSSStyleSheet>owner node</a> implements the {{LinkStyle}}
+<a>document or shadow root CSS style sheets</a> of which the <a for=CSSStyleSheet>owner node</a> implements the {{LinkStyle}}
 interface.
 
 <pre class=idl>
@@ -2968,7 +2968,7 @@ generally not listed.
 
 Changes From 5 December 2013 {#changes-from-5-december-2013}
 ------------------------------------------------------------
-
+* The <code>styleSheets</code> IDL attribute is moved from {{Document}} to {{DocumentOrShadowRoot}}.
 * API for alternative stylesheets is removed: <code>selectedStyleSheetSet</code>,
     <code>lastStyleSheetSet</code>, <code>preferredStyleSheetSet</code>,
     <code>styleSheetSets</code>, <code>enableStyleSheetsForSet()</code> on {{Document}}.