In T401506#11169918, @Dragoniez wrote:

In T401506#11169730, @Dabao_qian wrote:

A quick and dirty way is using {{#invoke:String|match|<currect user name>|^%d+-%d+-?%d*%d+$|nomatch=}} to match the format of temporary account. But I haven't found a way to get the current user name yet.

{{#ifeq:{{#invoke:String|match|{{REVISIONUSER}}|^~2|nomatch=}}|~2|temp|other}} would do the job. Matching against /^~2/ should be pretty sufficient under the WMF-wiki setup because $wgAutoCreateTempUser['matchPattern'] is defined as ~2$1 in CommonSettings.php#4369.

In T401506#11169627, @Dragoniez wrote:

This change would raise server load concerns; hence stalled.

In T401506#11169563, @Dabao_qian wrote:

Another example is MediaWiki:Blockedtext, the "Appeal on talk page" section should only display to registered users and temporary users but not anonymous users because anonymous users doesn't have their own's talk page and Special:Mytalk of an anonymous user will redirects to login page.

In your case, I think you should use a Lua module instead to parse $7 for user type. You don’t really need to rely on JS and CSS to achieve that, AFAICT. See e.g. the Util class in https://ja.wikipedia.org/wiki/Module:IP.

In T401506#11085151, @Niharika wrote:

@Dragoniez thanks for your effort on this task! We discussed this internally and think it is better to implement the logout confirmation step for all users as outlined in T378806: Add confirmation step to exit session flow for temp accounts. Our team will take on this work (or if you want to - more than happy to support!).

I will mark this task as stalled for now until we have clarity about other use cases which require loading JS and CSS scripts for temp accounts specifically.

I think that Cantonese Wikipedia, Wuu Wikipedia and Gan Wikipedia should also make the change.