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Editorial Team
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Asked: 2026-05-15T16:21:28+00:00

This happens in all browsers, so there must be a reason. Example: <html> <body>

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This happens in all browsers, so there must be a reason.

Example:

<html>
<body>
<script>var a="support/";
var aa='<iframe src="http://google.com/' + a + '" />'; 
document.write(aa)</script> 
<script>alert('test')</script>
</body>
</html>

The code after the iframe write (in this case alert(‘test’)) doesn’t execute. Why?

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1 Answer

  1. Editorial Team

    Your HTML that you write into the document is invalid and causes the browser to fail interpreting the rest of the document, including the remaining <script> tags.

    You are writing <iframe src="http://google.com/support/. Add "></iframe> and it’s ok.

    However, a cleaner approach would be not to use document.write at all (assuming you have some HTML element with id=”container” to hold the iframe):

    var iframe = document.createElement('iframe');
iframe.setAttribute("src", "http://google.com/support/");
document.getElementById("container").appendChild(iframe);
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