Colour-Contrast-Checker
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Tool itself can have insufficient contrast
Since the background color changes based on the colors being compared, the tool itself can fail WCAG contrast requirements.
When I compared #C4C4C4
and #FFFFFF
, the page heading ("colour contrast checker) and HSL sliders fail contrast requirements:
In this example, the background colour is #C4C4C4
(contrast of 1.74 to background), the heading color is #FFFFFF
, and the slider bars are #939393
(contrast of 1.76 to background).
I would recommend not changing the whole tool's background colour, and having a preview swatch instead.
Second this. This is a great tool but I can't read the copy when the accessibility is poor.