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<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Strings</h1>
<h2>The concat() Method</h2>
<p>The concat() method joins two or more strings.</p>
<p>Join "Hello" and "world!" with a space in between:</p>
<p id="demo"></p>
<script>
let text1 = "Hello";
let text2 = "world!";
let result = text1.concat(" ", text2);
document.getElementById("demo").innerHTML = result;
</script>
</body>
</html>