<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<meta http-equiv='X-UA-Compatible' content='IE=edge'>
<title>Processing Button MI</title>
<meta name='viewport' content='width=device-width, initial-scale=1'>
<link rel='stylesheet' type='text/css' media='screen' href='style.css'>
</head>
<body>
<button class="button">
<span>SUBMIT</span>
<svg viewBox="0 0 15 13">
<polyline points="2 6.5 6 10.5 13 2.5"></polyline>
</svg>
</button>
<script>
document.querySelectorAll('.button').forEach(button => {
button.addEventListener('click', e => {
button.classList.add('processing');
e.preventDefault();
});
});
</script>
</body>
</html>