Using CSS, you can specify a background image or background color for the html tag, and you can set the position of the image.
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta http-equiv="Content-Language" content="zh-cn"><!--(1)设置背景颜色:background-color(2)设置背景图像:background-image(3)设置背景图像的重复:background-repeat(4)背景定位:background-position(5)背景关联:background-attachment--> <style> h1 {background-color:#afa} h2 {background-color:rgb(255,187,187)} div#bgImage { background-image:url(images/bg_image.jpg); padding:10px; } div#bgImageKeywords { background-color:#ddd; background-image:url(images/d_sikao.png); padding:30px; background-repeat:no-repeat; background-position:left bottom; } div#bgImagePercent { width:400px; background-color:#ddd; background-image:url(images/d_sikao.png); padding:40px; background-repeat:no-repeat; background-position:20% 80%; } div#bgImageOffset { width:400px; background-color:#ddd; background-image:url(images/d_sikao.png); padding:40px; background-repeat:no-repeat; background-position:200px 20px; } div#bgImageAttach { background-image:url(images/bg_image.jpg); padding:10px; background-attachment:fixed; } </style><title>CSS 背景</title> <h1 id="这是一个h-级别的标题-淡绿色">这是一个h1级别的标题:淡绿色</h1> <h2 id="这是一个h-级别的标题-淡红色">这是一个h2级别的标题:淡红色</h2> <h3 id="这是一个h-级别的标题-没有设定样式">这是一个h3级别的标题(没有设定样式)</h3> <div id="bgImage"> <p>这个段落有背景图像,有内边距,允许重复(默认)</p> <p> </p> </div> <br> <!--使用 关键字 描述背景图像的位置。位置关键字可以按任何顺序出现,只要保证不超过两个关键字:一个对应水平方向,另一个对应垂直方向。如果只出现一个关键字,则认为另一个关键字是 center。--> <div id="bgImageKeywords"> <p>淡灰色背景色,同时有背景图像,不允许重复,背景图像居 左下方 显示</p> <p> </p> </div> <br> <!--使用 百分比 描述背景图像的位置。百分比是图像相对于元素的位置(而不是整个浏览器窗口)。 如果只提供一个百分数值,所提供的这个值将用作水平值,垂直值将假设为 50%。这一点与关键字类似。--> <div id="bgImagePercent"> <p>背景图像相对元素居 水平20%,垂直80% 显示</p> <p> </p> </div> <br> <!--使用 偏移量 描述背景图像的位置。即图像的左上角与 background-position 声明中的指定的点对齐。--> <div id="bgImageOffset"> <p>背景图像相对元素左上角的偏移量为水平200px,垂直20px</p> <p> </p> </div> <br> <!--背景关联。如果文档比较长,那么当文档向下滚动时,背景图像也会随之滚动。当文档滚动到超过图像的位置时,图像就会消失。--> <div id="bgImageAttach"> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> <p>这个段落的背景图像不会随着文字滚动。</p> <p> </p> </div>Rendering:

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.

The role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.

HTMLisaspecifictypeofcodefocusedonstructuringwebcontent,while"code"broadlyincludeslanguageslikeJavaScriptandPythonforfunctionality.1)HTMLdefineswebpagestructureusingtags.2)"Code"encompassesawiderrangeoflanguagesforlogicandinteract

HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.

HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.

HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.


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