border-width实现回复效果_html/css_WEB-ITnose
一、发现
前端渣哥逛博客园，经常看到博文评论有这种如下这种效果：
开始还以为是用图片实现的，额...。像博客园这种访问量大的网站，能用js/css实现的就不会用图片代替，果然，仔细一看，两个span就能实现这个效果了。
二、实现
看到不会或者不清楚的，总想探个究竟，并把知识变成自己的。接下来就花点时间，实现这种效果。
2.1 以span 设置 border-width:20px; 为例，这样相当于一个 40*40 的正方形（上下(20*2)和左右(20*2)），然后平分成4份，怎么平分呢，上下左右4个全等三角型就是了。既然这样，我们就可以轻松实现以下效果了：
2.2 有了上面的做法，我们同样可以再用一个span，实现如下效果：
这样，把浅蓝色部分换成白色，就可以实现遮挡，再通过绝对定位，就可以实现我们想要的效果了。
2.3 完整代码
<!DOCTYPE><html><head> <title>css实现博客园回复效果</title> <style type="text/css"> *{margin:0;padding:0;} #reply{ width:600px; margin:0 auto; } .reply_item{ padding:10px 20px; border-bottom:1px solid #EDD98B; } .reply_img{ float:left; } .reply_img a{ float:left; margin-top:20px; text-decoration:none; color:#fff; } .reply_img img{ width:60px; height:60px; border-radius:40px; } .reply_content{ margin-left:110px; background:#beceeb; padding:30px 20px; border-radius:18px; position:relative; } .dot{ border-style:solid; border-width:20px; border-color:#fff #beceeb #beceeb #fff; position:absolute; left:-40px; top:40px; } .top{ border-style:solid; border-width:10px 20px; border-color:transparent #fff #fff transparent; position:absolute; left:-40px; top:60px; } </style></head><body> <div id="reply"> <div class="reply_item"> <div class="reply_img"> <a href="http://www.cnblogs.com"> <img src="/static/imghw/default1.png" data-src="1.jpg" class="lazy" alt="用户头像" /> </a> </div> <div class="reply_content"> 好文，要攒 <div class="dot"></div> <div class="top"></div> </div> </div> </div></body></html>2.4 效果图：
三、总结
一个简单的demo，以此小记。代码不自己敲就不是你的，有空逛逛园子总会有收获。
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1387
52
Is HTML easy to learn for beginners?
Apr 07, 2025 am 12:11 AM
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.
What is the purpose of the <progress> element?
Mar 21, 2025 pm 12:34 PM
The article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati
The Roles of HTML, CSS, and JavaScript: Core Responsibilities
Apr 08, 2025 pm 07:05 PM
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.
What is the purpose of the <datalist> element?
Mar 21, 2025 pm 12:33 PM
The article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159
What is the purpose of the <meter> element?
Mar 21, 2025 pm 12:35 PM
The article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex
Understanding HTML, CSS, and JavaScript: A Beginner's Guide
Apr 12, 2025 am 12:02 AM
WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.
What is an example of a starting tag in HTML?
Apr 06, 2025 am 12:04 AM
AnexampleofastartingtaginHTMLis,whichbeginsaparagraph.StartingtagsareessentialinHTMLastheyinitiateelements,definetheirtypes,andarecrucialforstructuringwebpagesandconstructingtheDOM.
Gitee Pages static website deployment failed: How to troubleshoot and resolve single file 404 errors?
Apr 04, 2025 pm 11:54 PM
GiteePages static website deployment failed: 404 error troubleshooting and resolution when using Gitee...
