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I've all but forgotten the intricacies of the DOM due to jQuery. There's probably plenty of developers who have begun their careers in the past 5 years who probably don't know JavaScript as anything other than where they put their document.ready block. Ditto for frameworks like ActiveRecord and the ability to write SQL, etc. Is the lack of underlying knowledge the fault of the framework?

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The blame may not entirely be on the framework, but it is certainly on their documentation.

If something goes wrong, a developer should know which resources to use to solve the problem. Abstracting away the lower level stuff should not be synonymous to keeping it completely hidden and inaccessible.

A good example is the AngularJS source code, which is commented enough for anyone to make sense of it after a read-through.

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