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Comment by stellar678 | Hacker News Reader

There's no reason you couldn't code this up in JavaScript:

  load jquery from google
    - onload, set flag jquery_loaded
  settimeout load_locally_if_not_flag 5sec

Don't forget that JavaScript is blocking. You'd need to load the jQuery from Google dynamically by inserting script tags.

By the time you've added that, timeouts and fallbacks the amount of inline JS would make hosting jQuery on a CDN pointless.