- 圆角,border-radius: 1-4个数字/1-4个数字,前面是水平,后面是垂直,不给“/”表示水平和垂直一样,举例如下:
-
<head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style><br /> // 如果是两个数字,则左上角和右下角一样,右上角和左下角一样 .box{width:200px;height:200px;border:1px solid #000; border-radius:20px;} </style></head><body> <div class="box"></div></body>
-
<head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> // 100px/150px表示每个角的水平和垂直,同时可以前面四个/后面四个,则分别表示四个角的水平和四个角的垂直 .box{width:200px;height:300px;border:1px solid #000;border-radius:100px/150px;} </style></head><body> <div class="box"></div></body>
- 边框背景
-
<head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title><style> .box{width:200px;height:60px; -webkit-border-image:url(bt_blue.png) 0 10;border-left-width:10px;border-right-width:10px;}</style></head><body> <div class="box"></div></body>
- 线性渐变
<head> <meta http-equiv="Content-Type" content="textml; charset=utf-8"> <title>无标题文档</title><style> .box{width:300px;height:300px;border:10px solid #000; background-image:-webkit-linear-gradient(60deg,red,blue);}</style></head><body> <div class="box"></div></body>
- 可以设置多个背景
<head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> .box{width:300px;height:300px;background:url(bt_blue.png) no-repeat, url(border.png) repeat-y right 0;} </style></head><body> <div class="box"></div></body>
- border-image:边框图片
- border-image-source: 引入图片
- border-image-slice: 切割图片
- border-image-width: 边框宽度
- border-image-repeat: 图片的排列方式(round 平铺, repeat 重复, stretch 拉伸)
- border-colors:边框颜色
- 背景尺寸: background-size: x, y (100% 100%)
- background-origin: border | padding | content -box,分别表示从border区域开始显示背景,从padding区域开始显示背景,从content区域开始显示背景
- border-clip : border(从border区域向外裁剪背景), padding(从padding区域向外裁剪背景),content(从content区域向外裁剪背景)
- 遮罩

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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