Enlarge Gallery (React)
Using WTC's React gallery library (https://github.com/wethegit/react-gallery) and controlling image rendition by transitioning from the thumbnail. There are some small accessibility issues, making a gallery like this that allows the shuffling of items, but they're relatively small in the scheme of things, and probably forgivable under AA guidelines.
Source code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Enlarge Gallery - @wethegit/react-gallery</title>
<link rel="stylesheet" href="https://public.codepenassets.com/css/normalize-5.0.0.min.css">
<link rel="stylesheet" href="./style.css">
</head>
<body>
<div id="root"></div>
<script type="module" src="./script.js"></script>
</body>
</html>