What is dynamic HTML? How are pages of this type different from web pages written in PHP?

Dynamic HTML is a set of tools for creating dynamic, interactive web pages without server load. That is, a web page can react to some actions of a visitor, change its appearance, for example, or its content, without constantly contacting the server, which speeds up the page.
A web page written using the PHP language will constantly access the server, since PHP is a server-side language, which in terms of loading speed will be inferior to a page written in dynamic HTML.



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