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3 hours ago, AcidLava said:

I tried this via Tools.php but it doesn't work.

Redefine the purifyHTML method in Tools.

Add attributes to an existing tag:

$def->addAttribute(‘a’, ‘data-locale’, ‘Text’);

Add a new tag:

$def->addElement(‘canvas’, ‘Block’, ‘Flow’, ‘Common’, [‘data-url’ => ‘URI’]);