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Thanks for open sourcing your work. I had already built something similar to this and other commercial products, but in jQuery.

Really interested to see how this compares.

I did see the IE11 issue. Are there any thoughts on what can be implemented for a fallback?

I know there is some MuationObserver(which rrweb used to observe DOM update) API's shim library, but not sure the impact on performance.

BTW, rrweb is also a project to explore the power of modern browser, so IE issues may not be considered in a high priority.