This parser gets links from the JSON structures created by the Yootheme builder. The parser works with articles (com_content) and modules (mod_yoothem_builder).

This parser support replacing empty ALT attributes as well.

Yootheme stores the builder layout into the 'fulltext' field of a Joomla article. A (simplified) generated page is stored in the 'introtext' fields. This is for components like smart search to work properly. So all links and images are reported twice.

For links found by the yootheme parser (3) the 'Found on' section will only show the 'fulltext' instances. Even if you filter on 'introtext' (2)

When setting ALT-texts, use the 'Container / Item' (4) scope to replace the link in the builder layout and the generated content.

IF you use the 'Instance / Field' scope, only the builder content is updated and the alt empty tag will still show hits when filtering (1) but with an empty 'Found on'. This is until you edit and save the page from the yootheme builder itself.

The filters for 'field' and 'parser' can be enabled on the 'Links page options'  tab in the 'Broken Link Checker Configuration' (Options).