SSR typically refers to server side rendering of a single page app. I.e. render ...

cachehit on Aug 11, 2020 | parent | context | favorite | on: Single Page Applications using Rust

SSR typically refers to server side rendering of a single page app. I.e. render the HTML for a given route of an SPA. For that to work, you need to be able to execute your SPA code on the server which will be JS. You are right that WASM will change all of this, but the ecosystem is not mature yet.