What are the differences between user elements v0 and v1?
See caniuse.com before using v1 or even v0 .
v1 replaces v0, which was an experimental attempt.
v0 was a specification proposed only for Google, and v1 was the WHATWG web standard adopted by all major browser providers (implemented in Chrome, Opera, Firefox, and partially in Safari).
More on some of the publications on the Internet:
All about custom HTML elements (v0 and v1).
What's new in custom elements (from one author).
If you are new to Custom Elements, forget v0 .
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