The Drupal Learning Curve: a configurators view. WYSIWYG Filter. The WYSIWYG Filter module provides an input filter that allows site administrators configure which HTML elements, attributes and style properties are allowed. It also may add rel="nofollow" to posted links based on filter options. It can do so with no additional parsing on user input. That is, it may apply nofollow rules while parsing HTML elements and attributes. The filter is based on whitelists that can be defined from the filter settings panel. HTML attributes related to DOM events (on*) are not allowed for security reasons (to prevent XSS, etc.). The following elements cannot be whitelisted due to security reasons, to prevent users from breaking site layout and/or to avoid posting invalid HTML. The section used to whitelist style properties is pretty simple. When the "id" and "class" attributes have been whitelisted, it is also required to specify explicit rules that will be used to validate user input, and again, those that don't match will be stripped out.
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