JSFiddle - React, Tailwind, and code Playground

HTML

<img />

CSS

:root {
    margin: 0;
    padding: 0;
}

body {
    background-color: #444444;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-y: hidden;
}

@keyframes fade-in {

    0%   { opacity: 0; }
    100% { opacity: 1; }
}

.image-fade-in {
    animation: fade-in 1s ease-in-out;
}

JavaScript

const image = document.querySelector("img");
const marioSrc = "https://www.pinclipart.com/picdir/big/361-3619269_mario-16-bit-mario-bros-super-mario-world.png";

const isImageCached = (imageSource) => {

    let image = new Image();
    image.src = imageSource;

    const isCached = image.complete;
    image.src = "";
    image = null;
    
    return isCached;
};

if (!isImageCached(marioSrc)) {
	image.classList.add("image-fade-in");
}

image.setAttribute("src", marioSrc);