Professional CSS3

Creating proper selectors

The main problem of the CSS coder is creating proper selectors. Knowledge about priors in selectors is mandatory. It will help you to omit the !important statement in your code and will help you to create smaller and more readable files.

Using IDs

Using of IDs in CSS is rather bad behavior. The foundation of HTML says that an ID is unique and should be used only once in an HTML code. It is good to omit IDs in CSS and use them only when it is the only way to style some element:

#id_name {
  property: value;
}

Usage of IDs in CSS code is bad behavior because selectors based on ID are stronger than selectors based on classes. This is confusing in legacy code when you see that some part of the code is still preceded by another ...