CSS selector level 3规范中定义了一些和文档层级结构有关的连接选择器(或称组合选择器),
分为后代选择器(Descendant combinator/Child combinators)和同级选择器(Sibling combinators):
其中后代选择器分以下3个:
1. 空格。div p: 表示p是div的后代元素, div是p的祖先。该选择器选择所有div下的p后代元素。
2. 箭头(>)。表示直系关系。div > p 表示div的儿子辈的元素。3. 星号(*)。表示隔代关系。div * p表示div的孙子辈及之后的元素。
在线实例:http://wow.techbrood.com/fiddle/15759
同级选择器分为以下2个:
1. 加号(+)。表示紧随关系。h1 + h2: 表示紧跟在h1后面的h2元素。
2. 波浪号(~)。表示后续关系。h1 ~ h2: 表示和h1元素同在一个父元素下的后续h2元素(中间可以隔着其他元素)。
在线实例:http://wow.techbrood.com/fiddle/15761
关于CSS3选择器参考阅读:
http://techbrood.com/Guide/h5b2a?p=css-selectors
http://techbrood.com/Guide/h5b2a?p=css-pseudo-classes
by iefreer

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HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.

HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.

AnexampleofastartingtaginHTMLis,whichbeginsaparagraph.StartingtagsareessentialinHTMLastheyinitiateelements,definetheirtypes,andarecrucialforstructuringwebpagesandconstructingtheDOM.


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