html进阶css（1）_html/css_WEB-ITnose-HTML Tutorial-php.cn

Home

Web Front-end

HTML Tutorial

html进阶css（1）_html/css_WEB-ITnose

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 24, 2016 am 11:34 AM

<br /><!doctype html><html><head>           <meta http-equiv="content-type" content="text/html";            charset="utf-8">           <title>html和css的关系</title>           <style type="text/css">            h1{                 font-size:12px;                 color:#930;                 text-align:center;                 }<br />            span{<br />                 color:yellow;<br />                }           </style></head><body>           <h1 id="span-Hello-span-World"><span>Hello</span> World</h1><br /></body></html>

css的组成：选择器，声明=属性与属性值

css的语法：选择器{属性：属性值；}

说明：1）属性和属性值之间用：连接，声明必须要在花括号内

2）一个选择器可以有多个属性，属性和属性之间用；分号隔开。

3）一个属性可以用多个属性值，属性值与属性值之间用空格隔开

meta标签支持html中的全局属性。

http-equiv属性为名称/值对提供了名称。并指示服务器在发送实际的文档之前先要传送给浏览器的mime文档头部包含名称/值对。

当服务器向浏览器发送文档时，会先发送很多名称/值对。虽然有些服务器会发送许多这种名称/值对,但是所有服务器都至少要发送一格：content-type:text/html。这将告诉浏览器准备一个接受的html文档。（当然现在大多数浏览器都能自动识别HTML文档）

style type="text/css" 这段代表中间内容的风格是css格式。

例如：font-size:12px 是控制字体的大小

color:#930 是控制字体的颜色

text-align:center 是控制文字居中

span标签没有语义的它的作用就是为了设置单独的样式。在两种颜色或更多种颜色中它会选择最下面那种颜色。

<!doctype html><html><head>           <meta charset="utf-8">           <title>css之中的三种语法</title>           <link href="css的文件地址.css" rel="stylesheet" type="text/css" />           <style type="text/css">               span{                   color:blue;                   font-size:20px;                     }           </style></head><body>           <p style="color:red；font-size:12px">这里的颜色是红色</p>           <p>这是另外的<span>一个段落</span></p></body></html>

 以上是3种css的格式： 1）内联样式表就是<p style="color:red；font-size:12px"></p><br />css内联样式表就是把css代码直接写在现有的html标签中。<br />                    2)嵌入式样式表<style type="text/css"></style><br />嵌入式css样式就是可以把css样式代码写在style标签之中。一般情况下嵌入式css样式写在<head></head>之间。<br />                    3)外联样式表

 <link href="css的文件地址.css" rel="stylesheet" type="text/css" /><br />外联css样式就是把css代码写在一个单独的外部文件中，这个css样式文件以".css"为扩展名，在<head>内（不是在<style>标签内）使用<link>标签将css样式文件链接到html文件内。

注意：rel="stylesheet"type="text/css"是固定写法不可修改，使用外联样式的好处可以让用户打开网页的速度有所提升。<br />三种样式表如果在同一个标签内，它们的优先级：内联>嵌入>外联。

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

The Future of HTML, CSS, and JavaScript: Web Development TrendsApr 19, 2025 am 12:02 AM

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.

HTML: The Structure, CSS: The Style, JavaScript: The BehaviorApr 18, 2025 am 12:09 AM

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: Evolution and Trends in Web DesignApr 17, 2025 am 12:12 AM

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.

HTML vs. CSS vs. JavaScript: A Comparative OverviewApr 16, 2025 am 12:04 AM

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.

HTML: Is It a Programming Language or Something Else?Apr 15, 2025 am 12:13 AM

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

HTML: Building the Structure of Web PagesApr 14, 2025 am 12:14 AM

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.

From Text to Websites: The Power of HTMLApr 13, 2025 am 12:07 AM

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.

Understanding HTML, CSS, and JavaScript: A Beginner's GuideApr 12, 2025 am 12:02 AM

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

See all articles