I wouldn't use it myself, but I guess the justification is that you have the full power of a web page, crammed into a widget bar, and there are many frontend de

I wouldn't use it myself, but I guess the justification is that you have the full power of a web page, crammed into a widget bar, and there are many frontend devs who are most familiar with HTML+CSS+JS. Again, I wouldn't use it, and agree it's a bad idea as long as browser engines are monstrosities.