No. The agreement is that my browser will issue HTTP requests, their web server will return some HTML. There's a legal requirement that neither payload is intended to cause harm, but the agreement - unless I've signed a contract - does not go further than that.
If someone wants to feed ads into that content, that's their right. If I want to change the way that content displays, that's my right.
If someone wants to feed ads into that content, that's their right. If I want to change the way that content displays, that's my right.