app/popup.html (15 lines of code) (raw):
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<title>My Extension</title>
</head>
<body>
<h1>Book info from amazon</h1>
<textarea id="results" rows="8" cols="60"></textarea>
<div id="#place"></div>
<br><br>
<button id="go-to-options">Go to options</button>
<script src="scripts/popup.bundle.js"></script>
</body>
</html>