web: Improve Accessibility

[sauricat]

Resources:

• MDN Accessibility
• A11Y Checklist
• Firefox F12 Accessibility Check
• NVDA Screen Reader
• ...

Steps:

• Check: What should we do to improve a11y of our website? Can you make a checklist?
• Coding.

[Aquaticat]

哦，夜间模式
dark mode

[tusooa]

图库没法用键盘activate，点进去也没法切换图片