popup.html

<!DOCTYPE html>
<html>
<head>
       <title>Hello world </title>
       <script src="jquery-3.4.1.min.js"></script>
       <script src="popup.js"></script>
</head>
<body>
    <button type="button" id="harvest">Append to Clipboard!</button><br>
    <button type="button" id="cached-message">Load Cached Message</button><br>
    <textarea id="message"></textarea><br>
    Click the button to append the current to the clipboard, or paste a message into the first text area to convert it into a useful format. The result is placed in the clipboard buffer.<br>
    Use MacCtrl-I to hot-key harvesting, and use MacCtrl-U to hot-key generating the message and pasting it into the current text box.<br>
</body>
</html>