Layout Analysis 002: entry-level CSS navigation pop-up menu

Tag: Relative nbsp Relative ABS menu Pop-up menu record inheritance log

This pop-up menu is very interesting, also has the significance of the record, even can say, mastered this pop-up menu, basically CSS mastered almost.

The following three important knowledge are mainly involved:

1. The inheritance nature of CSS.
2. Relative absolute positioning.
3. Sub-selectors >

One inheritance

Inheritance refers to the style of child elements inheriting ancestors, but overrides can be overridden.

Two-position

If you want to make absolute positioning, you must first relative positioning, these knowledge has formed a functional type.

Three sub-selectors

Label 1> label 2 means: Label 2 must be a child element of label 1.

　　

Layout Analysis 002: entry-level CSS navigation pop-up menu