问题描述
我为Firefox 4中的特定网站制作了一个自定义样式表。在这里，我试图在我访问过的链接中添加红色'x'。现在，当我说的时候，我的意思是它以前工作了一段时间，在某些时候，这些'x停止出现（虽然其余的样式表工作正常）。
I'm making a custom stylesheet for a particular web site in Firefox 4. In it, I'm trying to prefix red 'x's to links that I've visited. Now, when I say making, I mean it used to work a while ago, and at some point, these 'x's stopped appearing (though the rest of the stylesheet works just fine).
现在，a：before（和a :: before，根据CSS3）工作正常。 a：参观工程罚款。
Now, a:before (and a::before, per CSS3) works fine. a:visited works fine. Neither a:visited:before nor a:visited::before works at all (well, almost).
在我的游戏测试中，我离开了一个:: before ，仍然有我的a：访问::前声明使用红色'x'。对于未访问的链接，a :: before内容是相同的文本颜色，但对于访问过的链接，:: before内容是正确颜色（红色）。
During my play-testing, I left in a::before, and still had my a:visited::before declaration to use red 'x's. For non-visited links, the a::before content was the same text color, but for visited links, the ::before content was the 'right' color (red).
这里有一个CSS的粘贴程序：
Here is a pastebin of the CSS at one point:http://pastebin.com/6Tzy1Q87
这里是一个屏幕截图CSS的结果：
And here is a screencap of what that CSS resulted in:http://i.stack.imgur.com/rtw9L.png
请注意，a ::之前简单地将内容指定为复选标记。
Notice that the a::before simply specifies the content to a checkmark. The a:visited::before should change the weight, color, and content, but only changes the color.
我听说过有关Firefox的最新安全功能，以及
I heard about a recent security 'feature' regarding Firefox and page history, but as I understood it, that would affect the regular a:visited selector as well.
推荐答案
选择器包括：visited 只允许在Firefox 4中更改颜色，是的。无论是否涉及 :: before ，都适用。请参阅
Selectors including :visited are only allowed to change colors in Firefox 4, yes. That applies whether or not ::before is involved. See http://dbaron.org/mozilla/visited-privacy
我会很好奇看到你有什么CSS允许你使用：visited 改变颜色以外的东西。
I'd be curious to see what CSS you had that allowed you to change something other than colors using :visited.
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