CSS is a basic front-end engineers, but a lot of people obsessed with learning basic skills javascript is not solid.
Some people may rush from the site w3school over again, just have some understanding on the surface of general concepts CSS, javascript headlong into the pit's impossible to escape. In fact, javascript in more complex logic will likely use a few lines of CSS styles will solve the problem, but also better performance
CSS has been able to become an elegant language, as well as their corresponding positions reconstruction engineers, because this is the language itself has a strong presence value, and really want to understand it is not easy.
Starting from the CSS Zen Garden, write CSS become an art. CSS2.1 and then from 3 to 4, CSS content covered and can realize the function has been greatly enriched, makes learning CSS costs are also increasing.
No amount of knowledge, a knowledge a knowledge points to learn, always learn to understand
