create css class js
var style = document.createElement('style');
style.type = 'text/css';
style.innerHTML = '.cssClass { color: #F00; }';
document.getElementsByTagName('head')[0].appendChild(style);
document.getElementById('someElementId').className = 'cssClass';
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// To add a class to an element:
const element = document.getElementById("myDIV");
element.classList.add("myClass");
// To get all classes of an element:
const element = document.getElementById("myDIV");
let classList = element.classList;
Thank you!
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