before-and-after 是做什么的？
捕获网页或元素的修改前后截图，用于视觉对比。当用户提到“前后对比”、“截图比较”、“视觉差异”、“PR截图”、“对比新旧版本”或需要记录UI变更时使用。接受两个URL（file://、http://、https://）或两个图像路径。
捕获网页或元素的修改前后截图，用于视觉对比。当用户提到“前后对比”、“截图比较”、“视觉差异”、“PR截图”、“对比新旧版本”或需要记录UI变更时使用。
这是一个专为AI编码助手（如Claude Code、Cursor、Codex）设计的技能，用于快速捕获网页或UI元素的前后对比截图，帮助开发者直观地验证UI变更。它支持两种输入方式：两个URL（文件路径、HTTP或HTTPS协议）或两个本地图像路径。技能基于无头浏览器自动化截图，生成可视化差异对比，特别适用于代码审查（PR）、UI回归测试或文档更新场景。当用户提出“前后对比”、“截图比较”、“视觉差异”等指令时，该技能会自动触发。
npx skills add https://github.com/vercel-labs/before-and-after/tree/main/skills/before-and-afterInstalled? Explore more 图像 skills: steipete/songsee, affaan-m/frontend-design, mattpocock/improve-codebase-architecture · View all 6 →
捕获网页或元素的修改前后截图，用于视觉对比。当用户提到“前后对比”、“截图比较”、“视觉差异”、“PR截图”、“对比新旧版本”或需要记录UI变更时使用。接受两个URL（file://、http://、https://）或两个图像路径。
Generate spectrograms and feature-panel visualizations from audio with the songsee CLI.
Create distinctive, production-grade frontend interfaces with high design quality. Use when the user asks to build web components, pages, or applications and the visual direction matters as much as the code quality.
Scan a codebase for deepening opportunities, present them as a visual HTML report, then grill through whichever one you pick.
Add documentation for a new AI provider — usage docs, env vars, Docker config, image resources.
Tests in real browsers via Chrome DevTools MCP. Use when building or debugging anything that runs in a browser. Use when you need to inspect the DOM, capture console errors, analyze network requests, profile performance, or verify visual output with real runtime data. Requires the chrome-devtools MCP server to be configured.
This skill should be used when the user wants to visualize data. It intelligently selects the most suitable chart type from 26 available options, extracts parameters based on detailed specifications, and generates a chart image using a JavaScript script.