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WCAG 2.2 之前都沒有分前後景顏色對比,3 之後同樣兩個顏色,前後景顏色會有對比差異。
https://colorable.jxnblk.com/ 挑選兩個顏色,檢查對比度以及預覽感覺
https://www.learnui.design/tools/accessible-color-generator.html
https://color.adobe.com/zh/create/color-contrast-analyzer
WebAIM: Contrast Checker
Colorblind Web Page Filter
APCA Contrast tools
Does the contrast ratio actually predict the legibility of website text?
https://www.color-blindness.com/coblis-color-blindness-simulator/