Level A – For a site to reach the first level of conformance related to the color aspects of the Distinguishable guideline, a site cannot use color alone to convey meaning. An example of this is specific link colors for different link states. Using color as the sole method to display the different states would not meet this level of accessibility. To comply with this guideline, your site would need additional indicators, like underlines, borders, and/or icons, to convey the link states for users who can't distinguish between colors. See the Success Criterion 1.4.1 Use of Color for the specific language. Level AA – To reach this level of conformance, the information presented must have a contrast ratio of at least 4.5:1 for regular-sized text and 3:1 for large-scale text, generally defined as an 18 point or larger font size or 14 point if bolded, though the actual size depends upon the chosen font. Contrast ratio refers to the difference in lightness between the background color and the text color. To reach this level, these properties must be defined in your CSS properties. As an example, black text on a white background is the highest level of contrast you can achieve with a ratio of 21:1. Having light blue text (e.g., #61B0FF) and a yellow background (e.g., #FFFF00) would not meet the minimum contrast ratio. The boxes below show both examples; you can see how the low-contrast box is harder to read, even more so for someone who cannot see colors. See Success Criterion 1.4.3 Contrast (Minimum) for the specific language. This box has a 21:1 contrast ratio. This box has a 2.13:1 contrast ratio. Level AAA – To reach this level of conformance, the contrast ratio must be at least 7:1 for regular-sized text and 4.5:1 for large text. See Success Criterion 1.4.6 Contrast (Enhanced) for the specific language.
Web Content Accessibility Guidelines (WCAG) 2.1 Keep this web site bookmarked for future reference for projects. The site contains the official guidelines published by W3C regarding accessibility

Identify a POUR Principle and describe the Web content that can be applied to make a website more accessible to those with each disability. The Perceivable principle focuses on ways a user receives information through the senses, like sight, hearing, and touch. The Operable principle focuses on ways a user might use technology, such as keyboard, mouse, microphone, and hand gestures, to interact with the site. The Understandable principle focuses on site usability and whether the information on the site is presented in a manner that users can comprehend. This may mean presenting information in multiple modes. An example is supplementing text information with illustrations or videos since some users find it difficult to comprehend written text but can understand the information from watching the video. The Robust principle focuses on ensuring the Web content can be accessed across different technologies. However, due to the vast amount of technology out there, this might require defining a baseline to develop for, such as deciding to only support browsers 5 years old or newer. This requirement would allow you to support a broad range of users, and those whose technology falls outside the baseline requirements may still be able to use some of the content. Any requirements you develop should be based on the purpose and audience of the website you are developing. WCAG https://www.w3.org/TR/WCAG21/

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