CSS编写的网页打开流畅相关知识与注意点
作者 佚名技术
来源 CSS技术
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发布时间 2012-03-05
| ibute. GOOD - .tree-folderpane-icon[IsImapServer="true"] { } 3.8、Rely on inheritance! Learn which properties inherit, and allow them to do so! We have explicitly set up XUL widgetry so that you can put list-style-image (just one example) or font rules on the parent tag, and it will filter in to the anonymous content. You don''t have to waste time writing a rule that talks directly to the anonymous content. BAD - #bookmarkMenuItem > .menu-left { list-style-image: url(blah); } GOOD - #bookmarkMenuItem { list-style-image: url(blah); } In the above example, the desire to style the anonymous content (without understanding that list-style-image inherits) resulted in a rule that was in the class category, when this rule really should have ended up being in the most specific category of all, the ID category. Remember, especially with anonymous content, that they all have the same classes! The bad rule above causes the icon of every menu to be checked to see if it is contained in the bookmarks menu item. This is hideously expensive (since there are many menus); this rule never s |
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