Hi @Hilbrand Valham ,
Normally, webkitSpeechRecognition should work in Edge as well because in this doc it says Edge is "Implemented with the vendor prefix: webkit".
Judging from the error message, it is caused by multiple "start" event triggered by button click as mentioned in your question. It can just possibly be the network issue which caused the first attempt failure. You can also provide a minimal code example that can help us reproduce this issue if possible.
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Best Regards,
Shijie Li