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Editorial Team
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Asked: 2026-06-10T13:58:23+00:00

I started learning JS recently, and I have a problem I can not figure

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I started learning JS recently, and I have a problem I can not figure out… I tried a lot of solutions and nothing helped.

I have a very basic JS code:

<body>

<h1>My First JS Page</h1>

<p id="demo">My First Paragraph.</p>

<script>
document.getElementById("demo").innerHTML="My First JavaScript";
</script>

</body>

The code works when the script is below but if I attach the same script as an external, and connects it to the HTML in the HEADER, the script just does not work ….

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1 Answer

  1. Editorial Team

    You should wrap external scripts in a 

    window.onload

    example

    HTML

    <!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>My first JS</title>
<script src="test.js"></script>
</head>

<body>
<h1>My First JS Page</h1>
<p id="demo">My First Paragraph.</p>
</body>
</html>

    JS Filename test.js

    window.onload = function () {
    document.getElementById("demo").innerHTML="My First JavaScript";
    //more code can go here if you want
}
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