[pygy_]

I may be wrong, but I think that document.write() will load the script synchronously while inserting a `script` element will not.

[acdha]

You can set async=false on a dynamic script element to avoid the default asynchronous behaviour.

[pygy_]

I just looked at the support matrix: IE10+. So it is reasonably supported nowadays, nice :-)

[acdha]

Working on the web is refreshing like that these days — so many things which used to be painful are now just standards + “Microsoft doesn't support that old version of IE and neither do we”.