How to implement secondary tab in html

html method to implement secondary tab: first open the software that writes web page code, and create a new html web page file, write html code in the body; then write in the [

The operating environment of this tutorial: windows7 system, html5 version, DELL G3 computer. This method is suitable for all brands of computers.

html Method to implement secondary tab:

1. Open the software that writes web page code, and create a new html web page file, and write the html code in the body :

 
 
 
 一级 
 
二级
 
二级
 
 
 
 
 

2. Write the css code in:

3. After saving and running, as shown in the figure, when the mouse is placed After the previous level menu is displayed, the second level is displayed. Complete all steps

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