dom-examples

It's such an obvious answer perhaps is why nobody has commented it. But depending on the use, you might try web speech API synthesis. For example a Windows user might see a Cortana option whereas a Mac user might see Siri. Demo Here: https://mdn.github.io/dom-examples/web-speech-api/speak-easy... Read more here https://github.com/mdn/dom-examples/tree/main/web-speech-api

It looks like the plaintext is being padded so that its length is a multiple of the block size [1]. I can't find any resources that say you need to pad a message before encrypting it with AES-GCM though. The official examples from MDN [2][3] don't pad the message before encrypting. The source code links to a wikipedia article that states that padding isn't necessary for counter mode, which the code is using (GCM is Galois Counter Mode)[4]. [1] https://github.com/mprimi/portable-secret/blob/6efdb4618216f... [2] https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypt... [3] https://github.com/mdn/dom-examples/blob/main/web-crypto/enc... [4] https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS#5_....

Yeah, that seems to be the case (confirmed with their little example at https://github.com/mdn/dom-examples/tree/master/server-sent-...). Once the connection is closed you can see things, but that's not particularly useful for debugging!