Not by default. The big frameworks are first and foremost client side frameworks, which means in an extreme case the server is just sending down <html><script

Not by default. The big frameworks are first and foremost client side frameworks, which means in an extreme case the server is just sending down <html><script src=.../></html> (basically), and the client framework handles all of the rendering/data fetching. BUT — with a bit of work, you can set things up to do server side rendering. It requires you use Node at some point in your server stack, and you essentially call the library (on the server) and run their RenderToString function (each has a slightly different implementation). There are frameworks for this (next.js, nuxt.js) or you can roll your own - it’s not terribly complicated.