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In the early days of ajax proliferation, I remember reading blog posts where people recommended synchronous XHR to keep your code linear, instead of trying to understand callbacks, which would make the code too complicated.

Obviously crazy advice that the current generation of Javascript programmers was wise to disregard. /s

Well, yeah. You have one thread to work with in the browser, and if you tie it up with a synchronous XHR your application freezes until the request finishes.

By googling "jquery synchronous ajax". Here is the first result: https://stackoverflow.com/a/6685294

Although I don't recommend doing this it's hardly as difficult as your comment implies.

Not hard, but certainly wrong and deprecated as far as I can tell.

Deprecated Only in the main Thread , using in web worker is a perfectly valid and acceptable use

Synchronous XHR calls were not that uncommon back in the day.

Yikes

On its way out... but.... synchronous XHR still works. https://xhr.spec.whatwg.org/