1) ANSWER : w3.css OR Bootstrap ?
Bootstrap uses JavaScript as well as CSS and W3.CSS is a modern CSS
framework with built-in responsiveness. It supports responsive mobile
first design by default, and it is smaller and faster than similar CSS
frameworks . which helps in doing better SEO of your website too,
because JavaScript is the enemy of SEO.
2) ANSWER : What is SEO?
SEO stands for Search engine optimization which consists in
increasing the Quantity & Quality of your website traffic through any
search engine results.
3) ANSWER : Why is javascript the enemy of SEO?
It will also help visitors with JavaScript disabled or off, as well as
search engines that can't execute JavaScript yet.
4) ANSWER : Why W3.CSS called "pure CSS"?
Because W3.css is not using JavaScript as well here.
5) ANSWER : How does Bootstrap use javascript?
JavaScript is required for working on built in components like tabs,
dropdowns are defined in bootstrap.js file