We’ve more or less kinda settled on HTML

It's funny, one of the modern UI glitches that I hate the most is when a long bit of text is just truncated with ellipses instead of the whole thing being shown and you have to hold the mouse over to get it in a tooltip, or shudder actually click on the thing. HTML is great at word-wrapping and allowing the whole UI to "flow" with variable heights and widths as necessary - and yet that is never allowed to happen in apps.