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SKILL verified MIT Self-run

Css Debug

skill-majiayu000-spellbook-css-debug · by majiayu000

Use this skill to diagnose CSS and frontend layout issues such as positioning, overflow clipping, Tailwind class conflicts, z-index stacking, and React rendering visibility problems.

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Install

$ agentstack add skill-majiayu000-spellbook-css-debug

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • Prompt-injection patterns
  • Secret / credential exfiltration
  • Dangerous shell & filesystem operations
  • Untrusted network calls
  • Known-malicious package signatures

What it can access

  • Network access No
  • Filesystem access No
  • Shell / process execution No
  • Environment & secrets No
  • Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Reliability & compatibility

Security review passed
0 installs to date
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1mo ago

Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

Preview Execution monitoring

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About

CSS Debug Skill

css-debug true

使用场景

当用户遇到以下问题时使用此 skill:

  • CSS 定位问题(元素位置不正确、被裁剪、溢出等)
  • React 组件渲染问题
  • Tailwind CSS 类不生效
  • 绝对定位/相对定位问题
  • Flexbox/Grid 布局问题
  • z-index 层叠问题

调试步骤

1. 收集信息

首先向用户询问或获取:

  • 浏览器开发者工具中的 HTML 结构
  • 相关元素的 computed styles
  • 父容器的 CSS 属性(特别是 position、overflow、display)
  • 截图(如果有的话)

2. 常见问题检查清单

绝对定位内容被裁剪
问题:position: absolute 的元素被父容器裁剪
检查:
- [ ] 父容器是否有 overflow: hidden 或 overflow: auto
- [ ] 祖先容器是否有 overflow: hidden
- [ ] 父容器是否设置了 position: relative
- [ ] 元素的 top/left/right/bottom 值是否超出父容器

解决方案:
1. 将 overflow: hidden 改为 overflow: visible
2. 或将绝对定位元素移到更外层的容器
3. 或使用 fixed 定位(相对于视口)
元素位置偏移
问题:元素位置与预期不符
检查:
- [ ] positionX/positionY 或 left/top 值是否正确
- [ ] 最近的 position: relative 祖先是哪个
- [ ] 是否有 margin/padding 影响
- [ ] transform 是否影响定位上下文

解决方案:
1. 确认定位参考点是正确的祖先元素
2. 检查 CSS 单位(px vs % vs rem)
3. 使用浏览器检查器的"元素选择"功能定位问题
内容不显示
问题:React 组件渲染但内容不可见
检查:
- [ ] 元素是否有 width/height(可能为 0)
- [ ] opacity 是否为 0
- [ ] visibility 是否为 hidden
- [ ] display 是否为 none
- [ ] z-index 是否被其他元素遮挡
- [ ] color 是否与背景色相同

解决方案:
1. 在开发者工具中检查 Computed 面板
2. 临时添加边框或背景色调试:border: 1px solid red
3. 检查条件渲染逻辑
Tailwind 类不生效
问题:Tailwind CSS 类没有应用
检查:
- [ ] 类名拼写是否正确
- [ ] 是否被更高优先级的样式覆盖
- [ ] 动态类名是否正确生成(字符串拼接问题)
- [ ] tailwind.config.js 中 content 配置是否包含该文件

解决方案:
1. 使用 !important 临时测试:!overflow-visible
2. 检查 className 是否正确传递
3. 使用内联 style 作为备选方案

3. 浏览器调试命令

在浏览器控制台运行:

// 高亮所有绝对定位元素
document.querySelectorAll('[style*="position: absolute"]').forEach(el => {
  el.style.outline = '2px solid red';
  console.log(el, getComputedStyle(el));
});

// 查找 overflow: hidden 的容器
document.querySelectorAll('*').forEach(el => {
  const style = getComputedStyle(el);
  if (style.overflow === 'hidden' || style.overflowX === 'hidden' || style.overflowY === 'hidden') {
    el.style.outline = '2px dashed blue';
    console.log('overflow-hidden:', el);
  }
});

// 检查元素的完整 computed 样式
const el = document.querySelector('.your-selector');
console.table({
  position: getComputedStyle(el).position,
  overflow: getComputedStyle(el).overflow,
  display: getComputedStyle(el).display,
  width: getComputedStyle(el).width,
  height: getComputedStyle(el).height,
  top: getComputedStyle(el).top,
  left: getComputedStyle(el).left,
});

// 查找定位祖先
function findPositionedAncestor(el) {
  let current = el.parentElement;
  while (current) {
    const position = getComputedStyle(current).position;
    if (position !== 'static') {
      console.log('Positioned ancestor:', current, 'position:', position);
      return current;
    }
    current = current.parentElement;
  }
  console.log('No positioned ancestor found, using viewport');
  return null;
}
findPositionedAncestor(document.querySelector('.your-selector'));

4. React DevTools 检查

  1. 打开 React DevTools
  2. 选择问题组件
  3. 检查:
  • props 是否正确传递
  • state 是否包含预期数据
  • 条件渲染的条件是否满足

5. 常用修复模式

修复绝对定位被裁剪
// 问题代码

  
    被裁剪的内容
  

// 解决方案 1: 移除 overflow-hidden

  ...

// 解决方案 2: 条件性 overflow
const hasAbsoluteContent = blocks.some(b => b.props?.positionX !== undefined);

  ...

// 解决方案 3: 分离容器

  
    {/* 需要裁剪的内容 */}
  
  
    {/* 绝对定位内容 */}
  

输出格式

分析完成后,提供:

  1. 问题诊断:明确说明是什么导致了问题
  2. 原因分析:解释 CSS 机制和为什么会发生这种情况
  3. 解决方案:提供具体的代码修改建议
  4. 验证步骤:告诉用户如何验证修复是否有效

示例对话

用户:我的绝对定位元素被裁剪了

Claude:

  1. 请在浏览器中运行以下命令查找 overflow:hidden 的容器:

``javascript document.querySelectorAll('*').forEach(el => { const style = getComputedStyle(el); if (style.overflow === 'hidden') { el.style.outline = '2px dashed blue'; console.log('overflow-hidden:', el); } }); ``

  1. 请告诉我哪些容器被标记出来了
  2. 同时,请检查绝对定位元素的父容器是否有 position: relative

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.