A drop-down menu example of "proficient in CSS" and "proficient in css"

A drop-down menu example of "proficient in CSS" and "proficient in css"

This example is from the drop-down menu. I have made some changes, and the principle is indeed very simple, but the author's code has a clear sense of attention and is worth learning. In addition, the author's color changes during the interaction process, it is even accurate to the changes between borders. Although it cannot be seen from the perspective of the onlookers, it is worth learning and thinking about this meticulous thinking and design, the so-called subtle prescription shows whether the skill is mature. I think this makes sense! Don't talk about it. Go to the Code:

1 <! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2