
The new property allows the user to specify a URI for their semantics link node. On the web, it sets the `href` of the anchor element associated with semantics node. This is going to unlock better semantics support in the Link widget on web ([PR](https://github.com/flutter/packages/pull/6711)). Engine counterpart: https://github.com/flutter/engine/pull/53507 Fixes https://github.com/flutter/flutter/issues/150263