Hover over text ...

The :before method described in the post that Peter links to will replicate the text-only popup functionality using modern css, rather than the legacy javascript method that used to be available in Classic. That feature never linked to a different topic; it was just plain text wrapped in a javascript function (it may also have relied on Microsoft HTML Help (chm) dlls and if so wouldn't work outside Windows).

If you want functionality like Wikipedia, you'll need to look for a javascript library that provides that functionality and include those files in the project. You'd use a master page to ensure the correct script/css etc references get in to every topic.

On a side note, Knowledge Base output is designed to publish to very specific cloud knowledge base software, so is actually a super-cut-back output to work around limitations in those systems. I believe it generally strips out anything related to javascript and embeds styling rather than linking to a stylesheet, as the systems aren't usually designed to support rich user guide content.

Does this help? How to create hover text using HTML and CSS - Nathan Sebhastian

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.

I don't think there's a built in hover popup but you can do a click to popup. You just hyperlink to the required topic and choose either auto-sizing popup or custom sized popup. The user then clicks on the link and a popup window displays the information.

However, RH2022 is html and css standards compliant, so it should be possible to implement a solution using javscript, css and html. If there's an existing javascript library you should be able to integrate it - e.g. I added DataTables to a Classic project, and it should be easier to add in RH2022 due to the better standards compliance.

Also, if you can tell me where you're reading about the hover functionality I can take a look and perhaps provide some advice.