[feature] Content in iFrame not rendered

**Describe the bug**
The content I wish to monitor is within an iFrame and CD does not seem capable of capturing it's content.

**Version**
v0.39.11

**To Reproduce**
Steps to reproduce the behavior:
1. Add a site which contains an iFrame
2. Content within iFrame is not detected

**Note**
I can share a link to the site in question privately, but do not wish to do so publicly.