Js open devtools

I using Google Chrome with Dev Tools. I know how to open DevTools, but how to open it (DevTools) with js and html:

<!DOCTYPE html>

<button onclick="function()">Open Dev Tools</button>
<script type="text/javascript">
function function() {
    "Code  for Open DevTools ......"


But what is the this code Code for Open DevTools ......?


Simply just press F12 on your keyboard

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