[rudasn]

Looks like it needs javascript though.

Doesn't work for me on chrome mobile without JS.

[mpeg]

Javascript is actually great for accessibility, it’s really hard to properly implement WAI-ARIA without it. Most people with screen readers will have js enabled too.

[dmitriid]

The main reason I can think of is trapping input inside a modal dialog when it's required.

Browsers recently rushed the dialog element and still have no easy solution for this.

[XzAeRosho]

Those are pictures. Not actual demos.