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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Border Transition Test</title>
<style>
body {
font-family: system-ui, -apple-system, sans-serif;
padding: 40px;
max-width: 600px;
margin: 0 auto;
}
#toggle-button {
padding: 12px 24px;
font-size: 16px;
background: #3b82f6;
color: white;
border: 2px solid transparent;
border-radius: 6px;
cursor: pointer;
}
#toggle-button:hover {
background: #2563eb;
}
.red-border {
transition: border 200ms ease-in-out;
border: 8px solid red;
}
</style>
</head>
<body>
<h1>Border Transition Test</h1>
<p>Click the button to toggle a thick red border with a 200ms transition.</p>
<button id="toggle-button">Toggle Border</button>
<script>
const button = document.getElementById('toggle-button');
button.addEventListener('click', () => {
button.insertAdjacentHTML("afterend", "<div>asdfasdf</div>")
setTimeout(()=> {
button.nextElementSibling.classList.toggle('red-border');
}, 0)
});
</script>
</body>
</html>
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