Script for commenting on the page.
Answer 1, authority 100%
Quite a complex system, more complex than chat, although it has much in common with it. Try the example given first.
Next, you will need to store not only the username and message, but also the index / address of the page on which the comment was made, so that only its comments correspond to each page.
Oh yes.. There is another variation:
<a href="mailto:[email protected]"> !</a>
Pure html. But comments will have to be posted manually, and spammers will bother.
Not in html. You need to do a php script by linking comments to pages either by page IDs or page addresses.