Additional Notes

If the Pardot IFrame has the following HTML tag:

<base href="http://go.pardot.com">

And the IFrame itself is actually a secure page (HTTPS) rather than unsecure (HTTP), when loading the script in the Pardot IFrame, the browser tries to load an HTTP version of the script on an HTTPS page which will fail, breaking the tracking. The solution is to update the script on the Pardot IFrame to load the secure version of the script:

<script type="text/javascript" src="https://cdn.bizible.com/scripts/bizible.js" async=""></script>

There may already be other tracking code snippets in this area, such as a Google Analytics code. Be sure to separate them by a semicolon ; and a single space, like shown in this example:

<script type="text/javascript" src="https://cdn.bizible.com/scripts/bizible.js" async=""></script>; <script async="true" type="othercode_example" src="otherfile_example.js" ></script>

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Marketo Measure