This PR address a quick docs shortcoming and bulletproofs some CSS:
- Mentions the specific lack of support for
position: sticky
in Edge/IE11, including how those two browsers will render it asposition: relative
. - Wraps the
.sticky-top
styles in a@supports (position: sticky) {}
query so that only the browsers that properly support stickiness render it (thereby avoiding issues with relative styling in Edge/IE11). - Wraps docs navbar styles in
@supports
query.
Follow up to #22751 (closed).