前面的话
CSS3新增了一些关于文本的样式,其中text-overflow文本溢出和text-shadow文本阴影有些特别。因为它们有对应的overflow溢出属性和box-shadow盒子阴影属性。本文将详细介绍这两个作用在文本上的溢出和阴影属性
文本溢出
一般地,人们一提到文本溢出,想到的就是文本溢出的经典代码
white-<span style="color: #000000;">space: nowrap; overflow: hidden; text</span>-overflow: ellipsis;
但实际上,文本换行不一定非要使用white-space;overflow属性值也不一定非要使用hidden。
定义
text-overflow
值: clip | ellipsis
初始值: clip
应用于: 块级元素、替换元素、表单元格
继承性: 无
<span style="color: #000000;">clip: 不显示省略标记(...),只是简单的裁切,相当于无效果 ellipsis: 文本溢出时显示省略标记(...),省略标记插入的位置是最后一个字符</span>
[注意]当文本溢出属性应用于表单元格时,需要设置table-layout:fixed
[注意]该属性兼容性很好,兼容IE6+的主流浏览器及移动端iso和android
实现
【1】当存在长英文文本时,text-overflow属性起作用的前提是
overflow(或overflow-y或overflow-x):hidden | auto | scroll
【2】当文本为汉字时,text-overflow属性起作用的前提是
实现汉字不自动换行可使用word-<span style="color: #0000ff;">break</span>: keep-all; 或 white-<span style="color: #000000;">space: nowrap; overflow(或overflow</span>-y或overflow-x):hidden | auto | scroll
文本阴影
类似于盒子阴影,文本阴影也有x轴偏移、y轴偏移、模糊半径和阴影颜色这四个值,但是并没有阴影尺寸和内部阴影这两个值
定义
text-shadow
值: none | (h-shadow v-shadow blur color)+
初始值: none
应用于: 所有元素
继承性: 无
h-<span style="color: #000000;">shadow: 水平阴影位置(必须) v</span>-<span style="color: #000000;">shadow: 垂直阴影位置(必须) blur: 模糊距离(该值不能为负值,可选) color: 阴影颜色,默认和文本颜色一致(可选) </span>
[注意]该属性IE9-浏览器不支持
<span style="color: #008000;">//</span><span style="color: #008000;">多层阴影</span> text-shadow: 1px 1px blue,5px 5px 5px red;
[注意]不要加太多层阴影,会有性能问题
常见效果

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.

HTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.

ToinsertanimageintoanHTMLpage,usethetagwithsrcandaltattributes.1)UsealttextforaccessibilityandSEO.2)Implementsrcsetforresponsiveimages.3)Applylazyloadingwithloading="lazy"tooptimizeperformance.4)OptimizeimagesusingtoolslikeImageOptimtoreduc

The core purpose of HTML is to enable the browser to understand and display web content. 1. HTML defines the web page structure and content through tags, such as, to, etc. 2. HTML5 enhances multimedia support and introduces and tags. 3.HTML provides form elements to support user interaction. 4. Optimizing HTML code can improve web page performance, such as reducing HTTP requests and compressing HTML.

HTMLtagsareessentialforwebdevelopmentastheystructureandenhancewebpages.1)Theydefinelayout,semantics,andinteractivity.2)SemantictagsimproveaccessibilityandSEO.3)Properuseoftagscanoptimizeperformanceandensurecross-browsercompatibility.


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