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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>文字表示</title>
</head>
<body>
    <form id="htmlInputForm">
        <label for="htmlInput">文字を入力してください:</label><br>
        <textarea id="htmlInput" name="htmlInput" rows="4" cols="50"></textarea><br>
        <button type="button" onclick="displayHTML()">表示</button>
    </form>
    <div id="displayArea"></div>
​
    <script>
        function displayHTML() {
            var htmlCode = document.getElementById("htmlInput").value;
            document.getElementById("displayArea").innerHTML = htmlCode;
        }
    </script>
</body>
</html>
​
html