Change shadowRoots from rest parameter to a dictionary with an arra…

…y of shadow roots.

cssom-view-1/Overview.bs

@@ -1015,9 +1015,13 @@ Note: Some non-conforming implementations are known to return 32 instead of 24.
 partial interface Document {
  Element? elementFromPoint(double x, double y);
  sequence<Element> elementsFromPoint(double x, double y);
- CaretPosition? caretPositionFromPoint(double x, double y, ShadowRoot... shadowRoots);
+ CaretPosition? caretPositionFromPoint(double x, double y, optional <span>CaretPositionFromPointOptions</span> options = {});
  readonly attribute Element? scrollingElement;
 };
+
+dictionary <dfn dictionary>CaretPositionFromPointOptions</dfn> {
+ sequence&lt;ShadowRoot> <dfn dict-member for="CaretPositionFromPointOptions">shadowRoots</dfn> = [];
+};
 </pre>
 
 The <dfn method for=Document caniuse=element-from-point>elementFromPoint(<var>x</var>, <var>y</var>)</dfn> method must follow these steps:
@@ -1046,7 +1050,7 @@ instance, an element can be excluded from being a target for hit testing by usin
 1. If the document has a [=root element=], and the last item in <var>sequence</var> is not the [=root element=], append the [=root element=] to <var>sequence</var>.
 1. Return <var>sequence</var>.
 
-The <dfn method for=Document>caretPositionFromPoint(<var>x</var>, <var>y</var>, ...<var>shadowRoots</var>)</dfn> method must return the
+The <dfn method for=Document>caretPositionFromPoint(<var>x</var>, <var>y</var>, <var>options</var>)</dfn> method must return the
 result of running these steps:
 
 1. If there is no <a>viewport</a> associated with the document, return null.
@@ -1076,7 +1080,7 @@ result of running these steps:
  1. Let <var>caretPosition</var> be a <a for=/>tuple</a> consisting of a <var>caretPositionNode</var> (a <a for=/>node</a>) and a <var>caretPositionOffset</var> (a non-negative integer) for the position where the text insertion point indicator would have been inserted when applying
  the <a>transforms</a> that apply to the descendants of the <a>viewport</a>.
  1. Let <var>startNode</var> be the <var>caretPositionNode</var> of the <var>caretPosition</var>, and let <var>startOffset</var> be the <var>caretPositionOffset</var> of the <var>caretPosition</var>.
- 1. While <var>startNode</var> is a [=node=], <var>startNode</var>'s [=tree/root=] is a [=shadow root=], and <var>startNode</var>'s [=tree/root=] is not a [=shadow-including inclusive ancestor=] of any of <var>shadowRoots</var>, repeat these steps:
+ 1. While <var>startNode</var> is a [=node=], <var>startNode</var>'s [=tree/root=] is a [=shadow root=], and <var>startNode</var>'s [=tree/root=] is not a [=shadow-including inclusive ancestor=] of any of <var>options</var>["{{CaretPositionFromPointOptions/shadowRoots}}"], repeat these steps:
  1. Set <var>startOffset</var> to [=tree/index=] of <var>startNode</var>'s [=tree/root=]'s [=host=].
  1. Set <var>startNode</var> to <var>startNode</var>'s [=tree/root=]'s [=host=]'s [=tree/parent=].</li>
  1. Return a <a>caret position</a> with its properties set as follows: