What are the differences between Custom Elements v0 and v1?
See caniuse.com before using v1 or even v0.
v1 replaces v0 which was an experimental try.
v0 was a Google-only proposed specification while v1 is a WHATWG Web Standard adopted by all major browser vendors (implemented in Chrome, Opera, Firefox, Edge and partially in Safari).
More details on some Internet publications:
All about HTML Custom Elements (v0 and v1).
What's New in Custom Elements (from one of the author).
If you're new at Custom Elements, forget v0.
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