How to write a secondary drop-down menu in css

How to write a secondary drop-down menu in css: first create an HTML sample file; then use the display attribute of css to control whether the secondary drop-down menu is displayed or not; and finally check the running effect through the browser.

The operating environment of this tutorial: Dell G3 computer, Windows7 system, Chrome76.0&&CSS3 version.

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Pure CSS to implement secondary navigation drop-down menu

Thought:

Use the display attribute of css to control whether the secondary drop-down menu is displayed or not. When the mouse moves to the li tag of the first-level navigation menu, the ul tag of the second-level navigation menu is displayed. Since the implementation is relatively simple, the reference code is given directly here.

Pure CSS secondary navigation drop-down menu code

Running effect:

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