Just out of curiosity, what web apps are you thinking of that only require html, css, and javascript? Given, I believe there are some simple frameworks in javascript, but does anyone actually use just these three? Anything I can think of uses at least a database.
PHP and MySQL are back-end technologies. HTML, CSS, and JavaScript are front-end technologies. All sorts of useful apps can be written that don't require a data source.
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Just out of curiosity, what web apps are you thinking of that only require html, css, and javascript? Given, I believe there are some simple frameworks in javascript, but does anyone actually use just these three? Anything I can think of uses at least a database.
PHP and MySQL are back-end technologies. HTML, CSS, and JavaScript are front-end technologies. All sorts of useful apps can be written that don't require a data source.