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fix: make sure that document.createElement exists before using (#3706)

If you try and require videojs in an environment that doesn't implement `document.createElement` properly -- like in Node.js -- you could potentially get an error. This checks that `window.document && window.document.createElement` is available before calling `createElement`.
We specifically check `window.document` so that `global` module won't cause issues with it's shimming of `document.createElement` in `global/document.

Fixes #3665

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