When a client brower request a page from a web server, the server sends a http response. This response has a header, http response header. This header gives various information to the client. Usually following the http response header, or http header for short, comes the html document. The html document, itself has a tag for head and body. Meta tags in the head tag of the document are sometimes related to the http header when the meta tags have http-equiv attribute.

A html document can be created with various tags. Where can you find Internet Content Rating?