It seems that WebCrypto is already implemented in browsers. Does this library make use of it, or is it pure JavaScript? If so, why is that? Most crypto algos ar

It seems that WebCrypto is already implemented in browsers. Does this library make use of it, or is it pure JavaScript? If so, why is that? Most crypto algos are susceptible to side channel attacks, and trying to get that right in JavaScript across browsers doesn't look generally possible.