Why is jQuery not integrated within the browser

Question

Why isn\'t jQuery intergrated into browsers, so there would be no need to have to reference it on your site, and instead, the browser just notices the jQuery used, and every

Answer 1

Because then different browsers would have different incompatible versions.

Any native implementation is guaranteed to have some subtle difference from the real thing; eventually, we would need a cross-browser jQuery wrapper, and the cycle would repeat.

It would also make updates much more complicated.

It would also break other libraries that define $ functions (eg, Prototype).