What are the differences between Custom Elements v0 and v1?

Question

What are the differences between Custom Elements v0 and v1?

See caniuse.com before using v1 or even v0.

Answer 1

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.