Rocket Validator automatically checks your pages on the W3C Validator.
HTML issues tagged as st_title.
st_title is not allowed on
This issue is commonly caused by an old integration of ShareThis via Drupal or other CMS - the old code used invalid attributes like
st_title which were later changed to HTML5 custom data attributes.
- [ShareThis: how to migrate legacy buttons(https://sharethis.com/support/installation/migrate-from-sharethis-legacy-buttons-to-inline-buttons/)
- Drupal: W3C validator issues on st_url
- MDN: using data attributes
When was the last time you validated your whole site?
Keep your sites healthy checking for A11Y/HTML issues on an automated schedule.