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Editorial Team
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Asked: 2026-05-23T04:37:18+00:00

I’m trying to learn how to create a as a child of another using

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I’m trying to learn how to create a as a child of another using JavaScript. My example below is functioning fine in Chrome and IE, but in Firefox I get an error that says “viewport is not defined” for the viewport.appendChild line in the JS.

The html looks like this:

<body>
<div id="viewport"></div>
</body>

and the JS looks like this:

function createDiv() {

    var divTag = document.createElement("div");

    divTag.className ="tile";

    viewport.appendChild(divTag);

}
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1 Answer

  1. Editorial Team

    That’s because you haven’t defined viewport. Somewhere in the function above the appendChild line, add this:

    var viewport=document.getElementById('viewport');
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