Color-contrast-checking tools can compare two colors and report on the contrast ratio between them. Some tools will allow you to adjust these values until the ratio is sufficient, helping you to choose a color scheme that avoids contrast problems.
Readable content is accessible content. You should aim to choose words and sentence structures that are not difficult or unnecessarily time-consuming to read for your target audience.
The title of a web page is the page's accessible name.
To be as helpful as possible, the title should briefly tell the user what the page is about and where they are within the site.
Paragraphs of text are a fundamental core of web content. It's important to display them in a fashion that is optimally readable to the majority of your audience.
While accessibility for images often focuses on providing a text alternative for screen reader users, we can also look at the issue another way—providing a graphic alternative for text to make the underlying information or concept easier to understand.