我可能学到了“假”的CSS:伪类伪元素 的选择器除了根据id、class、属性等从DOM中获取元素的以外,还有很重要的一类,用来获取元素的特别内容或特别状态,这就是 伪元素(Pseudo-elements) 和 伪类(Pseudo-classes) [I] 伪元素 伪元素是对元素中的特定内容进行操作,选取诸如元素内容第一个字(母)、第一行,选取某些...
:hover——理论上能用于所有元素,比如#header:hover,其意思是指,当用户鼠标悬浮在id值为header的元素上时,应用指定的样式。 :active——理论上能用于所有元素,比如#header:active,其意思是指,当用户鼠标点击id值为header的元素时,应用指定的样式。 :focus——理论上能用于所有能够被焦点化的元素,多用于表单元素,比...
https://www.w3schools.com/css/css_pseudo_classes.asp What are Pseudo-classes? A pseudo-class is used to define a special state of an element. For example, it can be used to: Style an element when a user mouses over it Style visited and unvisited links differently Style an element ...
ul li:last-child例中的选择器从无序列表中选择最后一个列表项,并从其中删除右边框。 ul{padding:0;list-style: none;}ulli{display: inline;padding:020px;border-right:1pxsolid#000000;}li:last-child{border-right: none;} 注意: CSS :last-child选择器在Internet Explorer 8和更早版本中不起作用。在In...
CSS 伪类 Pseudo-classes CSS伪类是用来添加一些选择器的特殊效果。 语法 伪类的语法: selector:pseudo-class{property:value;} CSS类也可以使用伪类: selector.class:pseudo-class{property:value;} anchor伪类 在支持 CSS 的浏览器中,链接的不同状态都可以以不同的方式显示...
The syntax of pseudo-classes: selector:pseudo-class{ property:value; } Links can be displayed in different ways: Example /* unvisited link */ a:link{ color:#FF0000; } /* visited link */ a:visited{ color:#00FF00; } /* mouse over link */ ...
A CSS pseudo-class is a keyword added to a selector that lets you style a specific state of the selected element(s). For example, the pseudo-class :hover can be used to select a button when a user's pointer hovers over the button and this selected button
CSS进阶篇——伪类 (pseudo classes) 伪类(pseudo classes)要和选择器捆绑使用,用于表示某种状态(state)或关系(relation)。 它的形式是「选择器:冒号:伪类」。 AI检测代码解析 selector:pseudo_class { property: value; } 1. 2. 3. 链接 :link 表示未访问过的链接,:visited...
These pseudo-classes require some interaction by the user in order for them to apply, such as holding a mouse pointer over an element. :hover Matches when a user designates an item with a pointing device, for example holding the mouse pointer over it. ...
CSS 之伪类选择符(Pseudo-classes) 一、选择符 二、示例 h1{font-size:16px;} li:nth-child(2){color:#f00;} 第二行要变成红色 li:nth-child(2){color:#f00;} 结构性伪类选择符 E:nth-child(n) 结构性伪类选择符 E:nth-child(n) 结构性伪类选择符 E:nth-child(n) 1...