Since version 1.5, WordPress has used the wp_rel_nofollow() function to add a “nofollow” attribute to links. Version 2.3 introduced wp_rel_nofollow_callback() as a callback function to handle that addition, so developers were able to programmatically add a “nofollow” rel attribute value to any link. Google recently announced that the “ugc” link attribute value is now supported … Continue reading WP 5.3 introduces new functions to add UGC attribute to links, and implements it to comments