Get all elements in the body tag using pure javascript

If you want all elements inside the body tag, not just first level children, you can simply use getElementsByTagName() with a wildcard:

var elems = document.body.getElementsByTagName("*");

You can use document.querySelectorAll() for that.

If you really want all (including nested tags), use this

 var elements = document.querySelectorAll( 'body *' );

If you only want the immediate child nodes, use

 var elements = document.querySelectorAll( 'body > *' );

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