Everyone should be able to read your text
It is important that the text can be seen and is legible. If you want your visitors to understand it, they need to be able to read it.
Good text contrast makes sure everyone can see the text against the background it sits on.
Not everyone sees color the same way. WCAG has defined specific contrast requirements in the WCAG 2.1 AA guidelines to make sure text is legible to everyone. Follow those requirements and our contrast best practices to fix or prevent contrast issues.
Ally follows the contrast requirements to verify there is enough contrast between text color and background color. Poor text contrast is a major issue. Major issues impact accessibility, and while not severe, require attention.