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Blog author here, I have to admit I enjoyed your comment. This is because it's mostly reference documentation, so each method of each class has it's own page, for example:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

There is only so much you can do to simplify such a complex domain as time.

But there is a lot you can do to make your description reflect that reality

MDN docs tend to be very thorough and well-written. It looks like most of these pages are for various utility functions, each of which has its own page.

Dealing with dates and times and cache invalidation have been two of the hardest problems I've dealt with and the one uses the other.