JavaScript How to interpret (document)0[]

I saw a code fragment like this:

with(document)0[(getElementsByTagName('head')[0] || body).appendChild(createElement(xxx))]

I don't know how to understand with(document)0[]

Answer:1

This is not valid JavaScript syntax and, trying to read around that, the semantics are extremely unclear.

I imagine the author meant something like this:

document.getElementsByTagName('head')[0] || document.body.appendChild(createElement(xxx))

"If there are any <head> tag in the document, return the first. Otherwise return the the result of appending createElement(xxx) to the body".

Answer:2

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