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:

HTMLtagsdefinethestructureofawebpage,whileattributesaddfunctionalityanddetails.1)Tagslike,,andoutlinethecontent'splacement.2)Attributessuchassrc,class,andstyleenhancetagsbyspecifyingimagesources,styling,andmore,improvingfunctionalityandappearance.

The future of HTML will develop in a more semantic, functional and modular direction. 1) Semanticization will make the tag describe the content more clearly, improving SEO and barrier-free access. 2) Functionalization will introduce new elements and attributes to meet user needs. 3) Modularity will support component development and improve code reusability.

HTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese

The alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.


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