本地 caption 颜色 QA
字幕对比度检查器
在将 captions 烧录进视频前，按 WCAG 风格的对比度比例检查所选文字、描边和框体颜色。
Caption contrast workspace
Pick caption colors and check practical contrast ratios.
Paste captions to preview a styled
subtitle.
Caption text on caption box
Passes the 4.5:1 normal-text contrast target.
21:1
PASS
Caption text on dark video preview
Passes the 4.5:1 normal-text contrast target.
18.88:1
PASS
Outline against caption text
Passes the 4.5:1 normal-text contrast target.
21:1
PASS