Issue Summary

While using Chrome and viewing a Power-Up modal in Trello, if you click on a mailto link in the modal you are taken to a blank page instead of opening up your mail client. Users will instead see a Content Security Policy (CSP) error in their browser console

Steps to Reproduce

1. Open a Trello Board
2. Click on a Power-Up to bring up its modal
3. Click on a mailto link inside the modal

Expected Results

Your default mail client to open with the mailto address

Actual Results

You are shown a blank screen and browser console indicates a CSP error

Refused to frame '' because it violates the following Content Security Policy directive: "frame-src 'self' https: blob: http://5406241.fls.doubleclick.net/ *.walkme.com".

Workaround

Users can switch to a different browser eg Firefox or Safari