@BGLL
1. 权威指的不是身份，而是背后的人。 W3Schools 的维护者与 MDN 、 WPD 的维护者怎么比。
2. W3Fools 对 W3Schools 的评价很中肯，不用我复述

W3Schools still has issues but they have at least worked on the primary concern developers had. For many beginners, W3Schools has structured tutorials and playgrounds that offer a decent learning experience. However, it would be a mistake to continue your education without learning from more reputable sources, so when you're ready to level up, move on.

总的来说就是，如果你真心想学前端，请尽早离开 W3Schools 。

3. MDN 哪里不友好？

https://developer.mozilla.org/zh-CN/docs/Web/CSS/border-radius MDN 是这样介绍一个属性的
http://www.w3schools.com/cssref/css3_pr_border-radius.asp 是这样介绍的
你喜欢哪一个是你的偏好，
但是 MDN 明显更详实，更深入。
W3Schools 很明显的浅尝辄止的倾向。

如果你自学一个月了，还在 W3Schools 上，说明有问题。