Success Criterion 1.4.3 Contrast (Minimum)

The visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following:

Large Text

Large-scale text and images of large-scale text have a contrast ratio of at least 3:1;


Text or images of text that are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement.


Text that is part of a logo or brand name has no contrast requirement.

WCAG Level
WCAG Versions

What the issue is

Buttons with text that is too small or lacks sufficient contrast against the button background can be difficult to read for many users. This readability issue can particularly impact users with vision impairments, including those with low vision or color vision deficiencies. Ensuring text within buttons is clearly legible is crucial for all users to identify and understand the function of each button.

What the issue is

Links that do not have sufficient color contrast compared to the surrounding text or background color can create readability issues. This includes both textual links and image links.  Users with visual impairments, such as color blindness or low vision, may struggle to identify or read these links, which can significantly impede their web navigation experience. Links without adequate contrast fail to stand out, requiring users to exert more effort to find navigable elements, potentially leading to a frustrating experience.

What the issue is

Language selectors can fail colour contrast requirements when the text or graphical objects do not provide enough contrast against their background. This makes it difficult for users with visual impairments, including those with color vision deficiencies, to discern the options or current selection within the language selector widget.