I was under the impression that the feature came in from a user who creared it and pushed it, but it has been discontinued. I remeber reading something similar on it.
The problem is probably whatever engine is currently in vogue for html. Trident, ktml, gecko, presto. Etc.
the base idea behind it was to allow users to use HTML+css (pre flex I believe) to create quick informational pages, books, and other gameplay items.
Think of it this way. If you wanted to recreate GTA5’s phone browser in widget you would spend about a week or more. Making updates would take forever (on the plus side buy buttons would be easier…)
if you allow for HTML/CSS the same process takes a professional about a day if even. Adding stuff becomes trivial. And you can also have it work Online by publishing the pages to a website (except the buy buttons, that I’m not sure).
If epic were to support it/updare it, that would be great. However I honestly doubt it since the use of the feature is so niche…