在上一篇的博客中我们已经熟悉CSS语法,对于CSS代码格式也有了一些认识。下面我就来说一下CSS代码式:
选择器名称 { 属性名:属性值;属性名:属性值;......}
属性与属性之间用分号隔开;属性与属性值直接使用冒号连接;如果一个属性有多个属性值的话,那么多个属性值用空格隔开。
上述提到了我这一篇博客所要说的主题,就是选择器。选择器就是指定CSS语法要作用的标签,那个标签的名称
就是选择器。
基本的选择器可分为三种:
a)html标签名选择器:使用的是html的标签名,又叫元素选择器。
b)class选择器;使用的是标签内的class属性,又叫类选择器。
c)id选择器:使用的是标签内的id属性。
每一个标签都定义了class属性和id属性,用于对标签进行标识,方便对标签进行操作。在定义中,多个标签的
class属性值可以相同,而id属性值必须唯一,因为JavaScript中经常使用。
一CSS元素选择器
最常见的 CSS 选择器是元素选择器。换句话说,文档的元素就是最基本的选择器。如果设置 HTML 的样式,选
择器通常将是某个 HTML 元素,比如 p、h1、em、a,甚至可以是 html 本身。
下面举个最简单的例子:
<span style="font-size:18px;"><meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>CSS</title></span>

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.


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