Please check below
https://github.com/adobe/htl-spec/blob/master/SPECIFICATION.md
addSelectors
- adds the provided selectors (selectors string or selectors array) to the URI
${'path/page.woo.foo.html' @ addSelectors='foo.bar'}
<!-- outputs: path/page.woo.foo.foo.bar.html -->
${'path/page.woo.foo.html' @ addSelectors=['foo', 'bar']}
<!-- outputs: path/page.woo.foo.foo.bar.html -->
-
query
- adds, replaces or removes the query segment of a URI, depending on the contents of its map value
-
addQuery
- adds or extends the query segment of a URI with the contents of its map value
${'http://www.example.org/search?s=1' @ addQuery=jsuse.query, context='uri'}
<!-- outputs: http://www.example.org/search?s=1&q=htl&array=1&array=2&array=3 -->
Arun Patidar