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20 hours ago · C ( pronounced / ˈsiː / – like the letter c) [6] is a general-purpose programming language. It was created in the 1970s by Dennis Ritchie and remains very widely used and influential. By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating systems code (especially in kernels [7 ...
20 hours ago · HTML. An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). [vague] The first used version of HTML was written by Tim Berners-Lee in 1993 and there have since been many versions of HTML. The current de facto standard is governed ...
20 hours ago · 十四、UI元素伪类选择器. CSS中的UI元素伪类选择器主要用于定义用户界面元素的特殊状态样式，如链接的悬停（hover）、激活（active）状态，以及输入框的焦点（focus）状态等。. 这些伪类选择器允许你根据元素的当前状态来应用不同的样式规则，从而改善用户 ...
20 hours ago · 伪类选择器. 在CSS3中新增了一个结构伪类选择器，它能用更加简洁的代码，实现我们的某些需求。. 定义：结构伪类选择器主要根据的是文档的结构来选择元素，常常用在根据父级选择器选出某些想要的子元素。. 主要语法如下：. 区别 (:nth-child (n) 和 :nth-of-type (n ...
20 hours ago · 2. ID和标签的组合（ID and Type Selector） 语法：element#id; 作用：选择具有指定ID的所有指定类型的元素。 示例： section#main-content { padding: 20px; } 这将选择所有<section>元素，且这些元素具有id="main-content"。 3. 属性和标签的组合（Attribute and Type Selector） 语法：element[attr]
20 hours ago · ID在HTML文档中必须是唯一的。在CSS中，ID选择器以井号#开头，后跟ID名。例如，#header选择器会选择id="header"的元素。 #header { background-color: yellow; } 四、属性选择器. 属性选择器可以根据元素的属性及属性值来选择元素。例如，选择所有带有type="text"属性的<input>元素。
