Some aspects of accessibility require more technical skills or advanced knowledge of how people use the Web. Some accessibility requirements are easy to meet, yet understanding the basics of how people with disabilities use the Web helps implement them more effectively and efficiently.
Standards play a vital role in defining accessibility requirements for each of these components. More background is provided in Essential Components of Web Accessibility. To create such text alternatives, authors need authoring tools that support them to do so. This information needs to be processed by web browsers and then conveyed to assistive technologies, such as screen readers.
For instance, web content needs to include text alternatives for images. These components inter-relate and support each other.
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