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Added frame-sizing to my CSS reset, but unfortunaley ran into an issue with @codepen.io that required an exception. With `frame-sizing: content-block-size;` the editor loads in a weird tiny iframe until the user hits "Run pen", frame-sizing then recalculates and causes a layout shift.

awesome!

This is going to make it so much safer to include 3rd party content, rather than simply including their <script> Thanks to everyone who worked on this, I know it was tricky.