WCAG Mini Check од Jukka Tainio

1.
Line height (line spacing) to 1.5 times the font size;
Spacing following paragraphs to 2 times the font size;
Letter spacing (tracking) to 0.12 times the font size;
Word spacing to 0.16 times the font size.

https://www.w3.org/TR/WCAG22/#text-spacing

2.
Color blindness simulation feature that allows you to preview websites as they appear to people with different types of color vision deficiency (protanopia, deuteranopia, tritanopia, achromatopsia)

https://www.w3.org/TR/WCAG22/#use-of-color

accessibility, text spacing, readability, wcag, color blindness

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