[scroll-animations] ScrollTimeline constructor prose about default source should not link to the scrollingElement getter but rather a procedure to determine the scrolling element #11736
Description
Currently, the ScrollTimeline constructor indicates that lacking an explicit value provided via the options parameter that the source defaults to the document's scrollingElement. The link here points to https://drafts.csswg.org/cssom-view-1/#dom-document-scrollingelement which is the scrollingElement getter. However, ideally we would not reference a piece of API but rather the procedure used to determine the value returned by that API.