我见过的许多基于CSS的导航标签大都具有一类的特征：矩形的色块，也许仅仅是一个轮廓，对于当前选中的标签则没有边框，标签在鼠标指针游至其上时改变颜色。

Many of the CSS-based tabs I've seen suffer from the same generic features: blocky rectangles of color, maybe an outline, a border disappears for the current TAB, a color changes for the hover state.

youdao