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Editorial Team
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Asked: 2026-06-04T11:05:07+00:00

I am trying to code an iFrame to act as a test area in

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I am trying to code an iFrame to act as a test area in an in-browser HTML/Javascript/CSS IDE in chrome, but I am losing a lot of functionality due to certain bugs, and I was wondering if someone could tell me how to set the .src attribute of the iFrame to a URL with the html Javascript CSS etc code encoded directly in the .src attribute. Don’t tell me it can’t be done, because I know it can, I just lost the web page where I found this method. Also, as a side note, would it be possible to programmatically force this iFrame to refresh?

Thank you for your time,

Chris

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1 Answer

  1. Editorial Team

    From my research it looks like this has been deemed a security risk and so is disallowed in all browsers.

    MS IE site link excerpt:

    Data URIs are supported only for the following elements and/or attributes.

    • object (images only)
    • img
    • input type=image
    • link
    • CSS declarations that accept a URL, such as background, backgroundImage, and so on.

    HTML5 Security Cheatsheet: http://html5sec.org/

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