问题描述
我使用在IE中创建使用无效CSS属性的圆角
I'm using CSS3Pie to make round corners in IE which uses invalid CSS property
behavior: url(/PIE.htc);
如果我保持这个声明在我的主CSS，其他浏览器加载这个.htc文件，
If i keep this declarition in my main CSS will other browsers load this .htc file even they don't need this or only IE will load this file?
有什么好处保留行为：url（/PIE.htc）;
Is there any benefit to keep behavior: url(/PIE.htc);is seperate IE conditional stylesheet in terms of performance?
<!--[if lt IE 9]>
<link rel="stylesheet" type="text/css" href="ie8-and-down.css" />
<![endif]-->
整个代码如下
border: 1px solid #696;
padding: 60px 0;
text-align: center; width: 200px;
-webkit-border-radius: 8px;
-moz-border-radius: 8px;
border-radius: 8px;
background: #EEFF99;
behavior: url(/PIE.htc);
推荐答案
规范说。这意味着，理论上，由于行为是一个仅IE属性，不应该解析 url（）并且该文件不是由IE之外的浏览器下载的。
The spec says that browsers are to completely ignore declarations whose property names they don't recognize. This means, theoretically, that since behavior is an IE-only property, the url() should not be parsed, and the file not be downloaded by browsers other than IE.
我在IE9和Firefox 4上运行测试，加载，这里是F12开发工具和Firebug在其网络选项卡中分别显示。注意，Firebug不报告请求 /PIE.htc 文件的尝试。这意味着Firefox没有加载文件，即使它是在样式表中声明的，因为它不能识别行为属性。
I ran a test on IE9 and Firefox 4, loading the CSS3 PIE tabs demo, and here's what F12 Developer Tools and Firebug show respectively in their network tabs. Notice that Firebug reports no attempt to request the /PIE.htc file. That means Firefox didn't load the file even though it was declared in your stylesheet, because it doesn't recognize the behavior property.
IE9（F12开发人员工具）
Firefox 4（Firebug）
我会移动的唯一原因如果我不想用非标准属性和/或黑客来污染我的主样式表，那么属性到带有条件注释的仅IE样式表。
The only reason I'd move that property to an IE-only stylesheet with conditional comments is if I don't want to pollute my main stylesheet with non-standard properties and/or hacks.
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