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Let me say it again and again until everyone reminds it: NO, You Cannot Add Classes to WordPress Post Thumbnail / Featured Image.

A common idea circulating the web states that you can, and everyone goes with their own snippet of PHP code to add in your Theme index.php. They are all the same, and they are all wrong:

if ( has_post_thumbnail() ) {      // check if the post has a Post Thumbnail assigned to it.
  the_post_thumbnail( 'full', array( 'class'  => 'class2Add' ) );  // Add a class to the featured image/main post thumbnail

Why is this wrong? Because the array of class(es) that you pass to the function the_post_thumbnail() replaces the size classes WordPress has generated for this thumbnail.

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