A user was wondering how to add a background image to the password screen of an encrypted wiki (https://talk.tiddlywiki.org/t/background-image-on-login-page/3145). It was not obvious that an encrypted wiki is considered as "loading", so I updated this tiddler to hint at this.
I also added a hint to the other system tags $:/tags/RawMarkup.. since they can also be used for the same purpose.
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