[johnmw]

I'm not sure I follow? I think the GP was just talking about the ability to import other HTML fragments without JS? Something like:

  <fragment href="site-menu.html"/>

Which would load my shared site wide menu html into the parent div.

I'm not sure why JS would be needed here? (i.e in the same way html <select> elements are interactive without needing "JS").

Going a little more out there, what about cross domain imports for easy web component consumption?

  <fragment href="https://weather-widget.org?location=london" />

I can't see how this would be less secure than current cross domain JS imports?

It used to be sorta possible with HTML Imports but that spec got dropped [1].

[1] https://www.w3.org/TR/html-imports/

[mrpf1ster]

Is this not just an iframe?

[wruza]

Iframes are opaque for css, form fields and for js in some sense.