Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>The concat() method joins two or more strings:</p>

<p id="demo"></p>

<script>
var text1 = "Hello";
var text2 = "World!";
document.getElementById("demo").innerHTML = text1.concat(" ",text2);
</script>

</body>
</html>