Can you explain more? What so exciting about that? (or is it a response to another comment; seems not)
Not Marvin, but I can think of two reasons:
The Web specs are a lot more stable than any libraries. Most of what's in the browser platform now will still be there ten years from now.
If it's already in the browser, then it doesn't need to be downloaded, and it can be optimised for speed instead of optimised for size.
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