As well as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in this specification are non-normative.
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W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent.
An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.
Text alternatives are a primary way of making visual information accessible, because they can be rendered through any sensory modality (for example, visual, auditory or tactile) to match the needs of the user.
Providing text alternatives allows the information to be rendered in a variety of ways by a variety of user agents.
For example, a person who cannot see a picture can have the text alternative read aloud using synthesized speech.
To determine appropriate text alternatives it is important to think about why an image is being included in a document. Thinking like this will help you to understand what is important about the image for the page's intended audience.
Every image has a reason for being on a page, because it provides useful information, performs a function, or enhances aesthetics.
Therefore, knowing what the image is for, makes writing appropriate text alternatives easier.
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