关于CSS性能:

背景vs Background -color:

比较18个色块在一个页面上渲染100次的小 矩形，一次带有背景，一次带有background-color。

While these numbers are from a single page reload, with subsequent refreshes the render times changed, but the percent difference was basically the same every time. That's a savings of almost 42.6ms, almost twice as fast, when using background instead of background-color in Safari 7.0.1. Chrome 33 appears to be about the same. This honestly blew me away because for the longest time for two reasons: I usually always argue for explicitness in CSS properties, especially with backgrounds because it can adversely affect specificity down the road. I thought that when a browser sees background: #000;, they really see background: #000 none no-repeat top center;. I don't have a link to a resource here, but I recall reading this somewhere.

参考:https://github.com/mdo/css-perf#background-vs-background-color

有一个关于背景和背景颜色的错误

这个的区别， 当使用后台时，有时当你创建网页时 在CSS中 background: #fff //可以覆盖蒙版图像块(“顶部项目，文本或图像”)) 所以最好总是使用背景色 为了安全起见，在你的设计中，如果它是单独的

我发现你不能用background-color设置渐变。

如此:

background:linear-gradient(to right, rgba(255,0,0,0), rgba(255,255,255,1));

这不是:

background-color:linear-gradient(to right, rgba(255,0,0,0), rgba(255,255,255,1));

关于CSS性能:

背景vs Background -color:

比较18个色块在一个页面上渲染100次的小 矩形，一次带有背景，一次带有background-color。

While these numbers are from a single page reload, with subsequent refreshes the render times changed, but the percent difference was basically the same every time. That's a savings of almost 42.6ms, almost twice as fast, when using background instead of background-color in Safari 7.0.1. Chrome 33 appears to be about the same. This honestly blew me away because for the longest time for two reasons: I usually always argue for explicitness in CSS properties, especially with backgrounds because it can adversely affect specificity down the road. I thought that when a browser sees background: #000;, they really see background: #000 none no-repeat top center;. I don't have a link to a resource here, but I recall reading this somewhere.

参考:https://github.com/mdo/css-perf#background-vs-background-color

我注意到，当为Outlook生成电子邮件时……

/*works*/
background: gray;

/*does not work*/
background-color: gray;

其中一个区别是:

如果你以这种方式使用图像作为背景:

background: url('Image Path') no-repeat;

然后你不能用"background-color"属性覆盖它。

但是如果你使用背景来应用颜色，它和background-color是一样的，并且可以被覆盖。

例如:http://jsfiddle.net/Z57Za/11/和http://jsfiddle.net/Z57Za/12/