一、HTML文本格式化标签(这些标签都不换行)
eg:
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 5 <title>HTML文本格式化标签</title> 6 </head> 7 8 <body> 9 <b>定义粗体文字</b><br />10 <big>定义大号字</big><br />11 <em>定义着重文字</em><br />12 <i>定义斜体字</i><br />13 <small>定义小号字</small><br />14 <strong>定义加重语气</strong><br />15 <sub>定义下标字</sub><br />16 <sup>定义上标字</sup><br />17 <ins>定义插入字</ins><br />18 <del>定义删除字</del><br />19 </body>20 </html><br />
效果:
二、HTML图像
1、图像标签:
2、源属性(Src)、替换文本属性(Alt)
src: 指 "source",源属性的值是图像的 URL 地址。
alt:在浏览器无法载入图像时,替换文本属性告诉读者她们失去的信息。此时,浏览器将显示这个替代性的文本而不是图像。
3、图片应用实例
(1)将图片当做背景
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 5 <title>HTML图像</title> 6 </head> 7 8 <body background="1.png"> 9 <h3 id="图像背景">图像背景</h3>10 <p>gif 和 jpg 文件均可用作 HTML 背景。</p>11 <p>如果图像小于页面,图像会进行重复。</p>12 </body>13 </html>
效果:
(2)排列图片:使用align属性(align="bottom";align="middle";align="top")
(3)图像的浮动:使图片浮动至段落的左边或右边:使用align属性(align="left"或align="left")
(4)调整图像尺寸:通过改变 img 标签的 "height" 和 "width" 属性的值,可以放大或缩小图像
1 <body>2 <img src="/static/imghwm/default1.png" data-src="1.png" class="lazy" style="max-width:90%" style="max-width:90%" alt="HTML知识点总结以及典型例子讲解_html/css_WEB-ITnose" >3 <img src="/static/imghwm/default1.png" data-src="1.png" class="lazy" style="max-width:90%" style="max-width:90%" alt="HTML知识点总结以及典型例子讲解_html/css_WEB-ITnose" >4 </body>
(5)可以将图像作为链接使用
(6)创建图像映射:即使用
三、HTML表格
1、表格标签
2、表格中的空单元格
如果某个单元格是空的(没有内容),浏览器可能无法显示出这个单元格的边框。为了避免这种情况,在空单元格中添加一个空格占位符,就可以将边框显示出来。(
3、设置表格边框:

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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