my own function fadeOut on Vanilla.js

fadeOut

function fadeOut(selector, time){

	let timer = time || 400;
	let element = document.querySelectorAll(selector)[0];
	let timeForSetInterver = 20;
	let opacityStart = getComputedStyle(element).opacity;
	let count = timer / timeForSetInterver;
	let step = opacityStart / count;
	let i = 0;

	let forClear = setInterval(function(){

		let opacity = getComputedStyle(element).opacity;

		element.style.opacity = parseFloat(opacity) - parseFloat(step);

		i++;

		if(i == count){
		clearInterval(forClear);
		element.style.opacity = 0;
	}

	}, timeForSetInterver)

}

Thank you very much, I was looking for something like that.