Filter for Block Elements in wpautop()

[luehrsen]

This addresses the need to exclude certain block elements (iframe, img) from wpautop. Using the newly defined filter wpautop_block_elements every plugin dev, theme dev etc. can redefine, modify and enhance the list of block elements.

Exsample for functions.php

function add_block_elements($block_elements){   
        $block_elements[] = "iframe";   
        $block_elements[] = "img";      
        
        return $block_elements;
}
add_filter("wpautop_block_elements", add_block_elements);

Thanks for reviewing! :)

Regards,
Hendrik

[luehrsen]

Defined preexisting block elements as array, filtered that array, imploded to regex.

[nacin]

Neither iframes nor images are block-level elements. This mangling should not be left to plugins.

[luehrsen]

As for HTML standards, HTML5 does not any longer differentiate between inline and block, it rather has more categories possible for each element. ​http://dev.w3.org/html5/html4-differences/#content-model

Aside from digging into standards, there should be a standardized way for developers to exclude certain elements from wpautop. Disabling and optionally replacing the function (as it is regularly done) is not a suitable solution.

[wonderboymusic]

Newer discussion/patch on #28607.