WordPress Speed Up Service | WordPress Website Maintenance Packages 4.9 deleting span with data-* attributes?, by cviudez Hi all, We are developping an EpsilonWriter plugin for WordPress, see: EpsilonWriter plugin page The page is running well with WordPress 4.8.3. We tested the same code with 4.9 and it broke our equation editing. We use span tags and data-* attributes to mark the equations in our content. We were wondering if such a new behaviour si linked to any change of the following function in 4.9 remove_filter(‘the_content’, ‘wpautop’); remove_filter(‘the_excerpt’, ‘wpautop’); // $role -> add_cap( ‘unfiltered_html’ ); /// But we did not find information about changes on such functions with 4.9 So any idea that could help us to determine if it is a 4.9 issue or if it is due to a 4.9 change we need to adapt to would be very appreciated. 4.9 deleting span with data-* attributes?