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
| e of defense is the rule filtering that occurs based on the type of the key selector. The purpose of this categorization is to filter out rules so that you don''t even have to waste time trying to match them. This is the key to dramatically increasing performance. The fewer rules that you even have to check for a given element, the faster style resolution will be. As an example, if your element has an ID, then only ID rules that match your element''s ID will be checked. Only class rules for a class found on your element will be checked. Only tag rules that match your tag will be checked. Universal rules will always be checked. 3、Guidelines for Efficient CSS 3.1、Avoid Universal Rules! Make sure a rule doesn''t end up in the universal category! 3.2、Don''t qualify ID-categorized rules with tag names or classes If you have a style rule that has an ID selector as its key selector, don''t bother also adding the tag name to the rule. IDs are unique, so you''re slowing down the matching for no real reason. BAD - button#backButton { } BAD&n |
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