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Editorial Team
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Asked: 2026-05-13T21:25:34+00:00

I wrote a simple webpage as follows: <!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Strict//EN

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I wrote a simple webpage as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<title>pop</title>
</head>
<body>
<script type="text/javascript" charset="utf-8">
document.write(this === window);
</script>
</body>
</html>

I browse this page using IE6 and FireFox 3.5.8, both give an answer true. But when I press F12 in FireFox and type this===window in the console, it will give me an answer false, why?

Great thanks.

So if this in firebug means the firebug object, how can I reference the normal this?

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1 Answer

  1. Editorial Team

    The this keyword inside firebug refers to the firebug object not the window object.

    This is because of the scope of javascript execution.

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