Very cool:
Released: h-include.js, github.com/gustafnk/h-includ… – a Custom Elements version of @mnot's great hinclude.js.

May 4, 2016 · 4:57 AM UTC

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@adrobisch @stilkov Good question, I will clarify in docs. For me, h-include should only be used for secondary content (with fallback link)
I've tried to answer your question here :) github.com/gustafnk/h-includ…