CSS pseudo classes All In One CSS 伪类 https://developer.mozilla.org/en-US/docs/Web/CSS/Pseudo-classes W3C https://www.w3.org/TR/CSS1/ https://www.w3.org/TR/CSS2/ https://drafts.csswg.org/selectors-3/ https://drafts.csswg.org/selectors-4/ https://draft…
1.specify a state or relation to the selector selector:pseudo_class { property: value; } 2.Link 3.Dynamic Pseudo Classes apply styles when something happens to something. active:when a link is clicked on hover:when a cursor moves over a link focus:wh…
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference#Selectors 在css3规范中,定义了以下几种类型的selector: Basic selector type selector: elementname class selector: .classname ID selector: #idName universal selector:  * ns|* *|* attribute selector  [attr=valu…
Using just semantic CSS Pseudo-Classes you can help define important states for form elements that ensure the user provides the correct data without frustration.   input:focus { outline: none; box-shadow: 3px 3px 1px rgba(0,0,0,0.2); border: 1px soli…
DOM hierarchy pseudo-classes allow you to style specific elements based on where they fall in the hierarchy and what type of elements they are. You can also use :nth-child to target custom element patterns, like every other element. <!doctype html>…
The interactive pseudo-classes for links (and buttons) allow us to make sure the user knows what elements on the page are interactive and that they can use them to navigate the website. Targeting the a tag with href attr: a[href]:hover { text-decorat…
CSS Combinators Four different combinators in CSS3 descendant selector (space) child selector (>) adjacent sibling selector (+) general sibling selector (~) CSS Pseudo-classes A pseudo-class is used to define a special state of an element. Style an e…
<p>标签不能再包含<p>,也不能包含<div>,<div>可以包含<p> a 和 img 标签是特殊的行内元素,a标签可以包含div等,几乎所有的可替换元素都是行内元素,例如<img>.<input>等等,替换元素一般有内在尺寸,所以具有width和height,可以设定.例如你不指定img的width和height时,就按其内在尺寸显示,也就是图片被保存的时候的宽度和高度. 对于表单元素,浏览器也有默认的样式,包括宽度…
转载:http://www.cnblogs.com/ihardcoder/p/5294927.html CSS3伪类和伪元素的特性和区别   前端er们大都或多或少地接触过CSS伪类和伪元素,比如最常见的:focus,:hover以及<a>标签的:link.visited等,伪元素较常见的比如:before.:after等. 其实上面提到的这些伪类和伪元素都是CSS1和CSS2中的概念,CSS1和CSS2中对伪类的伪元素的区别比较模糊,甚至经常有同行将:before.:after称为伪类.CS…
I need to find a way to change CSS :hover properties using JavaScript. For example, suppose I have this HTML code: <table> <tr> <td>Hover 1</td> <td>Hover 2</td> </tr> </table> And the following CSS code: ta…