What unit should be used to define the font size of the page in the Web is still hotly debated today. Some people say that PX is a good unit, some say that EM has many advantages, and some are saying that percentage is convenient. There is a PK situation like CSS Font-Size: em vs. px vs. pt vs. percent. Unfortunately, there are still different pros and cons that make each technique less than ideal but still hard not to use. But the emergence of rem seems to make the situation a little better. You can take a look at the differences between rem, em and px. CSS3 REM sets the font size
When I develop, I usually use rem. For individual smaller icons, px is used. If em is used, you need to consider the inheritance of the parent element, which is more commonly used abroad.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
What unit should be used to define the font size of the page in the Web is still hotly debated today. Some people say that PX is a good unit, some say that EM has many advantages, and some are saying that percentage is convenient. There is a PK situation like CSS Font-Size: em vs. px vs. pt vs. percent. Unfortunately, there are still different pros and cons that make each technique less than ideal but still hard not to use. But the emergence of rem seems to make the situation a little better. You can take a look at the differences between rem, em and px. CSS3 REM sets the font size