JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.6.3.min.js"></script>
<body>
    <input id="SJISText" value="髙橋" type="text"/>
    <br/>
    <button type="button" onclick="validateSJIS($('#SJISText'))">Validate Shift-JIS</button>
    <p id="ErrorMessage"/>
</body>

JavaScript

//SJIS 記号、英数字、かな(01区～08区)
const SJISChar=...