[mark_and_sweep]

I believe XSLT 1 is still working in all major browsers today. Here's a simple HTML 5 example with two pages sharing a header template: https://gist.github.com/MarkTiedemann/0e6d36c337159a3e6d5072...

[_heimdall]

My main gripe is a decade(s?) old Firefox bug related to rendering an HTML string to the DOM.

That may be a fairly specific use case though, and largely it still works great today. I've done a few side projects with XSLT and web components for interactivity, worked great.

[mark_and_sweep]

What bug specifically?