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    What if the script is still loading? How do you know if the file was not found or if you just have to wait?
    – Sergey Orshanskiy
    Commented Oct 14, 2013 at 3:28
  • This solution works in my testing, as long as the script tag is placed directly in the document source. The document's onload event doesn't fire until all resources referenced in the page source have already loaded (or failed). If you need to insert scripts into the DOM later, though, you need another approach.
    – Jamey Sharp
    Commented Nov 27, 2013 at 18:29
  • Great solution. I don't understand why it hasn't been upvoted.
    – Lotfi
    Commented Nov 11, 2014 at 8:35
  • This assumes that the script will be loaded synchronously blocking everything else, which is not always true. In fact, it is not a recommended way of loading scripts.
    – Vitim.us
    Commented Jun 25, 2019 at 20:02