I suppose this is similar to
preliminary demo page
http://notab.tk/wacl - which is from
fossil.e-lehmann.de/releases/wacl/wacl.zip
maybe you want to try
??::dom attr "span" textContent "Updated Text"
or more specific, give this span an unique id as in <span id=here>This text..</span>
??::dom attr "#here" textContent "Updated Text"
or address as child of a parent-div with id "xx" use
??::dom attr "#xx > span" textContent
The notation of the attr specifier is CSS-style.
regards
Roland frank