WEBVTT

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What should image alt text say?

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Start with the job the image is doing.

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Provide the information people need.
6 image-description checks.

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Ask why the image is here
Its purpose decides the useful text alternative.
Information · Decoration · An action

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Describe useful information
Keep the wording relevant to the page.
What matters · Page context · Concise wording

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Handle decoration correctly
Purely decorative images usually need empty alt text.
No extra information · Empty alternative · Avoid repeated noise

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Explain linked images
Describe the action or destination the image provides.
Useful link purpose · Clear action · Expected destination

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Support complex diagrams
Give detailed information in nearby text too.
Short alternative · Full explanation · Accessible details

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Review it in context
Check the information still makes sense without sight.
Page meaning · Image purpose · Useful equivalent

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Your checklist
Ask why the image is here · Describe useful information · Handle decoration correctly · Explain linked images · Support complex diagrams · Review it in context

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Make important image information available.
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