Differences between selector types in CSS styles

Differences between selector types in CSS styles

In css styles, there are three selector types: "class", "tag", "advanced", and "class". One style can change the other style of "class, a style of "class" can also change a style of "label. 2. After "tag" is set, all default styles can be changed, you cannot change the "class" style or "advanced" style. 3. change all the default styles and the "class" style, however, the "advanced" style can change another "advanced" style.
For example, the default color and underline of link text are a style. If you want to change a link, you need to set a "class" style. If you set the aling style in "advanced", all links are changed to the style set in "advanced, if a link needs to be changed, you can only set another "advanced" style (the selector name can be written by yourself ).