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- 实现评论系统，包括评论输入、列表展示和集成指南
- 添加反应功能组件（ReactionBar、ReactionButton、ReactionPicker）
- 实现离线编辑支持，包括同步状态管理和冲突解决
- 添加主题定制功能，支持多种配色方案和主题预览
- 新增多视图布局选项（时间线、分组、砌体视图）
- 实现个人资料编辑器，支持头像、简介和自定义字段编辑
- 添加统计页面，展示存储使用情况和上传趋势
- 新增相册管理功能，支持相册创建、编辑和照片管理
- 实现响应式设计和加载骨架屏组件
- 扩展国际化支持，新增孟加拉语、波斯语、印尼语、日语、葡萄牙语等语言
- 添加错误边界组件和离线指示器
- 更新配置文件、路由和依赖项
- 新增完整的文档、测试用例和集成指南

2026-02-25 15:02:05 +08:00

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Accessibility Checklist

This document provides a checklist for ensuring accessibility compliance across the Timeline application.

General Principles

✅ All interactive elements are keyboard accessible
✅ Focus indicators are visible for keyboard navigation
✅ Color is not the only means of conveying information
✅ Text has sufficient contrast ratio (WCAG AA: 4.5:1 for normal text, 3:1 for large text)
✅ Touch targets are at least 44x44px
✅ Content is responsive and works on mobile devices

Semantic HTML

✅ Use semantic HTML elements (<nav>, <main>, <article>, <section>, etc.)
✅ Headings follow logical hierarchy (h1 → h2 → h3)
✅ Lists use proper list markup (<ul>, <ol>, <li>)
✅ Forms use proper form elements with labels
✅ Buttons use <button> element (not <div> with click handlers)
✅ Links use <a> element with proper href

ARIA Attributes

Required ARIA Labels

✅ Interactive elements without visible text have aria-label
✅ Icon buttons have descriptive aria-label
✅ Form inputs have associated labels or aria-label
✅ Landmarks have aria-label when multiple of same type exist

ARIA States

✅ Expandable elements use aria-expanded
✅ Selected items use aria-selected
✅ Checked items use aria-checked
✅ Disabled elements use aria-disabled
✅ Loading states use aria-busy
✅ Hidden content uses aria-hidden

ARIA Roles

✅ Custom widgets have appropriate roles
✅ Live regions use aria-live for dynamic content
✅ Dialogs use role="dialog" and aria-modal="true"
✅ Alerts use role="alert" or aria-live="assertive"

Focus Management

✅ Focus order follows logical reading order
✅ Focus is trapped in modals/dialogs
✅ Focus returns to trigger element when modal closes
✅ Skip links provided for main content
✅ No keyboard traps (user can always navigate away)

Keyboard Shortcuts

✅ Enter/Space activates buttons and links
✅ Escape closes modals and dropdowns
✅ Arrow keys navigate lists and menus
✅ Tab/Shift+Tab moves between focusable elements
✅ Home/End navigate to first/last item in lists

Forms

✅ All inputs have associated labels
✅ Required fields are marked with required attribute
✅ Error messages are associated with inputs using aria-describedby
✅ Form validation provides clear error messages
✅ Success messages are announced to screen readers
✅ Placeholder text is not used as labels

Images

✅ All images have alt text
✅ Decorative images have empty alt="" or aria-hidden="true"
✅ Complex images have detailed descriptions
✅ Icons have text alternatives or aria-label

Media

✅ Videos have captions/subtitles
✅ Audio content has transcripts
✅ Auto-playing media can be paused
✅ Media controls are keyboard accessible

Color and Contrast

✅ Text contrast meets WCAG AA standards (4.5:1)
✅ Large text contrast meets WCAG AA standards (3:1)
✅ UI components have sufficient contrast (3:1)
✅ Focus indicators have sufficient contrast
✅ Information is not conveyed by color alone

Responsive Design

Mobile (< 768px)

✅ Content is readable without horizontal scrolling
✅ Touch targets are at least 44x44px
✅ Text is at least 16px to prevent zoom on iOS
✅ Navigation is accessible on mobile
✅ Forms are easy to complete on mobile

Tablet (768px - 1024px)

✅ Layout adapts appropriately
✅ Touch and mouse interactions both work
✅ Content is readable and usable

Desktop (> 1024px)

✅ Layout uses available space effectively
✅ Keyboard navigation works smoothly
✅ Hover states are visible

Motion and Animation

✅ Animations respect prefers-reduced-motion
✅ Auto-playing animations can be paused
✅ Animations don't cause seizures (no flashing > 3 times/second)
✅ Parallax effects have alternatives

Test with:

✅ NVDA (Windows)
✅ JAWS (Windows)
✅ VoiceOver (macOS/iOS)
✅ TalkBack (Android)

Verify:

✅ All content is announced
✅ Navigation is logical
✅ Form labels are read correctly
✅ Error messages are announced
✅ Dynamic content updates are announced
✅ Images have meaningful descriptions

Component-Specific Checks

Albums

✅ Album cards have descriptive labels
✅ Photo grid is keyboard navigable
✅ Drag-and-drop has keyboard alternative
✅ Delete confirmations are accessible

Comments

✅ Comment form has proper labels
✅ Character counter is announced
✅ Submit button is keyboard accessible
✅ Edit/delete buttons have clear labels
✅ New comments are announced

Reactions

✅ Reaction buttons have descriptive labels
✅ Current user reaction is indicated
✅ Reaction counts are announced
✅ Reaction picker is keyboard accessible

Statistics

✅ Charts have text alternatives
✅ Data tables are properly structured
✅ Trends are described in text

Theme Customizer

✅ Theme options are keyboard accessible
✅ Color picker has keyboard support
✅ Preview updates are announced

Profile Editor

✅ Cover photo upload is keyboard accessible
✅ Crop tool has keyboard controls
✅ Custom fields are properly labeled
✅ Visibility toggles are clear

Testing Tools

Automated Testing

✅ axe DevTools
✅ WAVE
✅ Lighthouse Accessibility Audit
✅ Pa11y

Manual Testing

✅ Keyboard-only navigation
✅ Screen reader testing
✅ Zoom to 200%
✅ High contrast mode
✅ Color blindness simulation

Resources

Notes

This checklist is based on WCAG 2.1 Level AA standards
Regular accessibility audits should be conducted
User testing with people with disabilities is recommended
Accessibility is an ongoing process, not a one-time task

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