Allowing custom tags in TinyMCE for integration with indexhibit
You just need to add it to the list of short ended elements:
extended_valid_elements : "plug:plugin_name[*]",custom_elements: "~plug:plugin_name[*]",short_ended_elements: 'area base basefont br col frame hr img input isindex link meta param embed source wbr track plug:plugin_name'
Here's a fiddle to demonstrate.
Instead of:
closed : /^(br|hr|input|meta|img|link|param|area|plug:plugin_name)$/,
Does this work?
closed : /^(br|hr|input|meta|img|link|param|area|plug)$/,
Note the last item "plug" without the : modifier.
Have you tried this option?
valid_elements: "a,br,span,plug:plugin_name,another:tag"