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CKEditor 4 reached its End of Life (EOL) in June 2023. From then on, it will receive no more updates, new features, bug fixes, and security patches. Visit CKEditor 5 Docs for the actively supported CKEditor or check Extended Support Model.
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Class

CKEDITOR.filter.contentRule

class since 4.1.0 abstract
See source

Virtual class representing CKEDITOR.filter.check argument.

This is a simplified version of the CKEDITOR.filter.allowedContentRules type. It may contain only one element and its styles, classes, and attributes. Only the string format and a CKEDITOR.style instances are accepted. Required properties are not allowed in this format.

Example:

'img[src,alt](foo)' // Correct rule.
'ol, ul(!foo)'      // Incorrect rule. Multiple elements and required
                    // properties are not supported.

Filtering