@Bugreporter2 Could you please give a example on how this could be used?

Examples of the system messages I mentioned earlier would include, for example:

[[Mediawiki:editinginterface]] which could be changed depending on content model. For example 'you are editing a CSS page, etc'

Another one: [[Mediawiki:ns-tab]] could say something different for different content models, like 'user CSS page'.

Or [[Mediawiki: sitenotice]] could display something based on content model. [[Mediawiki:copyrights]] can also be used as a page-bottom general element, with switches (I know it's not intended as such, but it can be used that way).

There is also the potential for its use in things like custom toolbars, if and when that happens, and they are wikitext-based. Just one extra building block towards that.

Some notes:

"Magic Variables" are defined in <code>\includes\parser\CoreMagicVariables.php</code>

The following lines of code need to be added to an appropriate place. The second one with the e on the end is to return <code>plain_text</code> (with an underscore) rather than <code>plain text</code> (with a space character):

<pre>

			case 'contentmodel':
			case 'contentmodele':

</pre>

There is an array called <code>$wgContentHandlers</code> which should contain these four values:

<pre>
CONTENT_MODEL_CSS
CONTENT_MODEL_JSON
CONTENT_MODEL_UNKNOWN
CONTENT_MODEL_WIKITEXT
</pre>

And may have others added to it; in particular there's one for "Sanitized CSS" and possibly another one called JavaScript (though JSON=JavaScript, potentially. It's confusing.)

Now then, if matches, then output...

Does this help anyone?