Does the Web Server library use HTML4, 5 or does it matter?

Using Arduino Programming Questions
1

I do not see anywhere it saying HTML4 or HTML5, and do not know about HTML enough to realize if it matters.

2

a web server implements the HTTP protocol, it doesn't need to know anything about CSS, HTML, etc....

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3

the WebServer example of networking libraries shows how to use the TCP Server class EthernetServer or WiFiServer by creating a very simple web server which handles a HTTP request and sends a HTTP response with a very simple HTML page

4

The receiver (e.g. your browser) is the one that cares about this since it is the one that must parse and render it properly. The server does not care.

5

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