Why do such a thing? An example from your Five template: frontpage slider. Imagine, in the Caption field for a slide, if I want to write "17th event" but I want the "th" to be superscript.

Elxis 5.6 request: Not sure if this is possible, but it would be useful to be able to give a module an ID in parameters, similar to how we can already apply classes.
e.g. for pages with internal anchor links, to enable internal navigation via anchor link to a module that appears on the page.

No, this has nothing to do with the URL. There is no such issue as the one you mention.

You have been stopped because the security token is wrong. This happens when you open simultaneously multiple edit pages. Only the last opened in legitimate. If you try to submit (save) a previous one the request will be dropped. This feature is in order to be protected against XSS attacks.

Finally, Elxis password policy became a configuration option including password complexity (normal/high) and expiration.

Available options:
Normal - Never expires
Normal - Expires in 3 months
Normal - Expires in 6 months
Normal - Expires in 12 months
High - Never expires
High - Expires in 3 months
High - Expires in 6 months
High - Expires in 12 months

Elxis 5.6 focuses a lot on strengthen security in order to meet highest security standards.

When building an Elxis template, is there a parameter attribute to allow HTML tags?

e.g.  Optional attribute multilingual (value: 0 or 1). If multilingual = 1 then the text element becomes multilingual and the user is able to apply different values for each language.
e.g. <param type="text" name="myaddress" default="" label="Address" description="" multilingual="1" />

Basically I want to allow some simple HTML styles, e.g. <strong></strong> 

I have been trying to find the answer in the docs, e.g. https://www.elxis.net/docs/developers/libraries/elxisparameters.html
Apologies if it's already explained somewhere in the docs.