Bootstrap comes complete with many reusable CSS and JavaScript components that can help to achieve the functionality needed in almost any kind of website. You just have to use some HTML to plug them into your template, with no need to spend huge amounts of time writing complex CSS and JavaScript. Plus, all these components are responsive, too!

Bootstrap is compatible with all modern browsers and Internet Explorer versions 8 and up. If Bootstrap’s instructions are followed properly, you can create a website design that works in all these browsers. Plugins like HTML5Shiv and Respond.js come as part of Bootstrap’s default template. These help in porting HTML5 elements into older non-HTML5 browsers.

Bootstrap offers many ways to customize its default design. You can override all of its CSS and default JavaScript behaviour. Bootstrap is even more interesting if you are a Less or Sass developer, as it includes Less and Sass customization options. These options let you smoothly create a new template using Bootstrap.