1.4.6 Contrast (Enhanced)

What it is

The visual presentation of text and images of text has a contrast ratio of at least 7:1, except for the following:

Large Text: Large-scale text and images of large-scale text have a contrast ratio of at least 4.5:1;
Incidental: 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.
Logotypes: Text that is part of a logo or brand name has no contrast requirement.

Check: Large-scale text and images of large-scale text have a contrast ratio of at least 4.5:1;
Check: 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.
Check: Text that is part of a logo or brand name has no contrast requirement.
Use the sufficient techniques below as acceptable methods when applicable.
Confirm none of the common failures apply.

G17: Ensuring that a contrast ratio of at least 7:1 exists between text (and images of text) and background behind the text
G148: Not specifying background color, not specifying text color, and not using technology features that change those defaults
G174: Providing a control with a sufficient contrast ratio that allows users to switch to a presentation that uses sufficient contrast
G18: Ensuring that a contrast ratio of at least 4.5:1 exists between text (and images of text) and background behind the text

G156: Using a technology that has commonly-available user agents that can change the foreground and background of blocks of text

F24: Failure of Success Criterion 1.4.3, 1.4.6 and 1.4.8 due to specifying foreground colors without specifying background colors or vice versa
F83: Failure of Success Criterion 1.4.3 and 1.4.6 due to using background images that do not provide sufficient contrast with foreground text (or images of text)