css3 transition设置多个属性的时候不能只用逗号分隔？

Question

比如这个transition: width,height 1s ease;

Answer 1

transition: width,height 1s,1s ease,ease;
我知道了...后面的值也要用逗号多写一遍...

Answer 2

transition: width 1s ease, height 1s ease;