css vertical-align是相对于什么的位置？

Question

baseline
Aligns the baseline of the element with the baseline of its parent. The baseline of some replaced elements, like <textarea>, is not specified by the HTML specification, meaning that their behavior with this keyword may vary between browsers.
sub
Aligns the baseline of the element with the subscript-baseline of its parent.
super
Aligns the baseline of the element with the superscript-baseline of its parent.

这三个属性分别是什么效果？

Answer 1

baseline是基线对齐，基于文本的下边沿对齐。
sub和super的话，CO₂和㎡你肯定不陌生，两种对其方式就分别对齐于两者的2。