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>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. Return a <a>caret position</a> with its properties set as follows:

1. <a>caret node</a> is set to <var>startNode</var>.

1. <a>caret offset</a> is set to <var>startOffset</var>.