How to define allowed tags in CKEditor?

Question

• Sometimes users copy and paste text from different sources to CKEditor, but I want to restrict what tags they can copy to CKEditor.

• I only need to u

Answer 1

To add my input, there is since 4.1 the Advanced Content Filter feature, which allows for very specific rules for allowed content (what tags and which styles/attributes/classes for them). I find it very powerful and very nice to configure.

Read more at http://docs.ckeditor.com/#!/guide/dev_advanced_content_filter but here's a few examples from the page

config.allowedContent = true; // to allow all

// A rule accepting 
 and 
 elements with optional "left" and "right" classes.
// Note: Both elements may contain these classes, not only 
.
config.allowedContent = "p h1(left,right)";

// Rules allowing:
// * 
 and 
 elements with an optional "text-align" style,
// *  with a required "href" attribute,
// *  and  elements,
// * 
 with an optional "tip" class (so 
 element may contain
//  a "text-align" style and a "tip" class at the same time).
config.allowedContent = "p h1{text-align}; a[!href]; strong em; p(tip)";