On each web page, is the contrast between the colour of the text and the colour of its background sufficiently high (excluding special cases)?

WCAG Reference

3.2.1

On each web page, do texts and images of texts without bold effects with a rendered size of less than 24px meet one of these conditions (excluding special cases)?

The contrast ratio between the text and its background is at least 4.5:1.
A mechanism allows the user to display text with a contrast ratio of at least 4.5:1.
3.2.2

On each web page, do bold texts and bold images of texts with a rendered size of less than 18.5px meet one of these conditions (excluding special cases)?

The contrast ratio between the text and its background is at least 4.5:1.
A mechanism allows the user to display the text with a contrast ratio of at least 4.5:1.
3.2.3

On each web page, do texts and images of texts without bold effect with a rendered size greater than or equal to 24px meet one of these conditions (excluding special cases)?

The contrast ratio between the text and its background is at least 3:1.
A mechanism allows the user to display the text with a contrast ratio of at least 3:1.
3.2.4

On each web page, do bold texts and bold images of texts with a rendered size greater than or equal to 18.5px meet one of these conditions (excluding special cases)?

The contrast ratio between the text and its background is at least 3:1.
A mechanism allows the user to display the text with a contrast ratio of at least 3:1.
3.2.5

In the mechanism for displaying a compliant contrast ratio, is the contrast ratio between the text and the background colour high enough?