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- Plugin API/Hooks 2.0.x « WordPress Codex
mce_valid_elements: The valid html elements for the rich editor. ... add_filter(' mce_valid_elements', 'extended_editor_mce_valid_elements', 0); function ... - #3826 (TinyMCE misconfiguration causes erronous tag ...
Set up init variables $valid_elements = 'p/-div[*],-strong/-b[*],-em/-i[*],-font[*],-ul[*],- ol[*],-li[*],*[*]'; $valid_elements = apply_filters('mce_valid_elements', ... - Adding Quicktags to WordPress and to the TinyMCE Editor for WP ...
Feb 14, 2007 ... WordPress gives you a filter for doing that: mce_valid_elements. Define your tag using the TinyMCE format for valid elements and then add it to ... - tinymce - tiny mce valid elements end tag - Stack Overflow
I am not perfectly sure, but i think this issue is not to be solved easily. I do not think that you can configure this behavior because it is browser related ...
