JAVASCRIPT

what is Vanilla JavaScript

Vanilla JavaScript is a name to refer to using plain JavaScript 
without any additional libraries like jQuery.
VanillaJS === Plain `JavaScript`

vanilla js

(function () {
	console.log('test');
})();

//or simple
(() => {
	console.log('test');
})();

vanilla js

<button onclick="toggleDiv()">Toggle Div</button>

<div id="myDIV" class="hidden">
    This is my DIV content.
</div>

<style>
	.hidden {
      display: none;
    }
</style>

<script>
    function toggleDiv(){
        document.querySelector('#myDIV').classList.toggle('hidden');
    }
</script>