Custom tag support

[n0str]

A configuration file for appending custom tags to HTML Purifier

[mauritskorse]

Yes this would still very much be appreciated.
For now I have added two lines to the BlockHandler at line 251

editorjs-php/EditorJS/BlockHandler.php

Line 250 in 9446738

$def->addElement('mark', 'Inline', 'Inline', 'Common');

            $def->addElement('dfn', 'Inline', 'Inline', 'Common');
            $def->addAttribute('dfn', 'data-type', 'CDATA');

[mauritskorse]

I have added a possible solution to this. Haven't tested, commented and cleaned the code yet, so not ready for a pr.
See this fork: https://github.com/mauritskorse/editorjs-php/tree/feat/support-custom-html-tags