I’m sure I don’t have the expertise to understand the finer nuances of this, but I like the spirit:
Whilst previously we all decided to focus on shadow DOM and the custom-elements API first, we think the time is right — now that shadow DOM and custom-elements API have been shipping in Safari and Chrome and are in development in Firefox — to propose and standardize an API to instantiate HTML templates.
Let the frameworks compete on speed and developer convenience in other ways.
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Apple’s Proposal for HTML Template Instantiation is a post from CSS-Tricks