How to find with javascript if element exists in DOM or it's virtual (has been just created by createElement)

Question

I\'m looking for a way to find if element referenced in javascript has been inserted in the document.

Lets illustrate a case with following code:

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Answer 1

Do this:

var elem = document.createElement('div');
elem.setAttribute('id', 'my_new_div');

if (document.getElementById('my_new_div')) { } //element exists in the document.