If you know how the browsers work it will be easy to know where to put it.
First of all it's invalid to include your script after the body or the html element. Only comments and the closing tag for html are allowed after the body. Some browser will do recovery but you shouldn't depend on that.
You may include it any where in the body or the head but you should know that script take the browser attention may be for while and I will stop rendering the dom. That's very bad for user experience so the best place to include it just at the end of the body element.
Like in the example :
Foo
One more thing if you include the script at the top of the page and that script will manipulate the dom that may cause an error if the dom isn't ready yet. The script searching for element which is not exist yet. And it will be very confusing when it runs at time and it doesn't run in another time. You may check the answers for similar questions here and here
