Visitor’s browser downloads the CSS file just once and re-used the same file for other pages on a site.
Dividing style from content makes life very comfortable for visitors who opt to view just the content of a webpage, or to change the content. These could be low sighted people who may use a screen reader to translate a page.
Best practice for the use of CSS is creating you HTML first. Most designers develop their CSS all at once they create the HTML. Though it appears logical to develop both at the same time, but in reality you will save more time if you generate the entire HTML prototype first. The reason for using this method is that we recognize all the elements of our website site layout, but we do not know what CSS we’ll need with our design. Developing the HTML layout firstly allows us to visualize the entire webpage as completely, and permits you to think of your CSS in a top-down fashion (Biundo & Enge, ...Show more