Allow <Details> html tags in popups

[ingean]

Map popups can be configured using HTML which allows for a lot of creativity. However not all HTML tags are allowed (for security reasons I guess), but being able to use <details> and <summary> would be neat as it would allow users to hide / show (collapse) content in the popup. Thus, it would provide a better user experience for popups with a lot of content (e.g. images, histograms, tables etc.).  

Example markup:

<details> <summary>Open for details</summary>Here is more information </details>

[JCGuarneri]

This would would be extremely useful to me. The other option I'd considered is the "button" tag, but this solution seems more flexible.

[ZachSvoboda]

@BjornSvensson Yes, please add this capability. Would make my Dashboard pop-ups look much more professional and easier to sell GIS capabilities to prospective users.