The browsers really need to make it possible to use templates and slots without javascript at all. There's no reason I shouldn't be able to define and use a custom element using HTML alone.
Until then I don't know if template and slot will take off.
Until then I don't know if template and slot will take off.
Ironically it was Firefox that killed it, not Google. Google was all in on HTML imports. It would have also given a non JS way to dynamically load HTML. Streaming would have been great with this.