Bootstrap comes with a set of pre-styled responsive, mobile-first components that possess a definite UI kit. Tailwind CSS uses a set of utility classes to create a neat UI with more flexibility and uniqueness. Sites created using Bootstrap follow the generic pattern that makes them look identical.

In CSS, the term "box model" is used when talking about design and layout. The CSS box model is essentially a box that wraps around every HTML element. It consists of: margins, borders, padding, and the actual content.

Semantic HTML elements are those that clearly describe their meaning in a human- and machine-readable way. Elements such as header , footer and article are all considered semantic because they accurately describe the purpose of the element and the type of content that is inside them.