之前项目里有个半透明的Tag组件如下，长度随字数自增，箭头可左可右。
开始用代码实现，分拆为【圆角矩形+圆角三角】2个元素组合实现，但总是无法完美实现，原因至少有：
- 半透明特性，若有重合区域会透明度叠加重影。
- 两元素的高度定位总无法匹配一致（viewport缩放导致）。
多次折腾后摸索出一个方法，使用小图片，组合多个 CSS3的background子属性 ，只用一个元素实现效果：
padding-right: 18px; background-image: url(https://img.alicdn.com/tps/TB1t0O9IFXXXXb8XXXXXXXXXXXX.png), url(https://img.alicdn.com/tps/TB1hNC6IFXXXXaEXpXXXXXXXXXX.png); background-position: right 0; background-size: contain; background-repeat: no-repeat, repeat-x; background-clip: padding-box, content-box;
- 首先利用CSS3的多重背景图特性，为一个元素插2张图（图片都很小）。
- 再使用 background-clip 的特性，将2张背景图片附着于元素的不同区域，这个特性类似box-sizing的设置。
- 顺带的，这里可以结合 background-origin 理解下，两种属性的值选项范围相同，但概念有差别，所以实现的效果不同。
- clip是裁剪，origin是起点。前者会破坏背景图完整度，后者只改变背景图出现的起点区域。具体定义 可戳这里 。
- 之后结合双重赋值的 background-position 和 background-repeat 属性，为pading和content区域的背景图片进行差异化设置。
- 注意这里的repeat，矩形主体部分因为是repeat-x刷出的，所以代码里使用了 background-clip 而不是 background-origin ,后者在这里的效果被 background-repeat 低效。再次体现了CSS调试里常见的 交叉干扰 现象
- 这样就可以达成一个 单元素长度自适应Tag 。
最终元素布局审查如图
What is the purpose of the <datalist> element?Mar 21, 2025 pm 12:33 PMThe 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 <progress> element?Mar 21, 2025 pm 12:34 PMThe 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
What is the purpose of the <meter> element?Mar 21, 2025 pm 12:35 PMThe 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
What is the purpose of the <iframe> tag? What are the security considerations when using it?Mar 20, 2025 pm 06:05 PMThe article discusses the <iframe> tag's purpose in embedding external content into webpages, its common uses, security risks, and alternatives like object tags and APIs.
What is the viewport meta tag? Why is it important for responsive design?Mar 20, 2025 pm 05:56 PMThe article discusses the viewport meta tag, essential for responsive web design on mobile devices. It explains how proper use ensures optimal content scaling and user interaction, while misuse can lead to design and accessibility issues.
How do I use HTML5 form validation attributes to validate user input?Mar 17, 2025 pm 12:27 PMThe article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.
What are the best practices for cross-browser compatibility in HTML5?Mar 17, 2025 pm 12:20 PMArticle discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.
How do I use the HTML5 <time> element to represent dates and times semantically?Mar 12, 2025 pm 04:05 PMThis article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit
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
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
