Can we build perfect website if we know just HTML&HTML5&JS if the answer is Yse please explain and if is No also explain why?

Question

we need to improve our coding and help us to understand what we should know if we want build perfect website

Answer 1

HTML 5 + js make yours website UI design perfect, but for secure functionality u need to add server side script like php, ruby on rails, asp.net etc, js is only client side, which have no websites security.

Answer 2

No, not necessarily. A website needs styling too, and you can't do that with neither HTML nor JS, you'll need CSS! A website also needs something called a 'back-end', which would process any input from the website and perform interactions with your website's database. You can do it with JS, but it isn't the most user-friendly solution