Alternative text (alt text) is meant for readers who cannot see an image, such as blind readers and readers who use a text or mobile browser. It should summarize an image's purpose, and should not duplicate its caption. Every image should have alt text, except for purely decorative images, which should instead have "|alt=|link=".
Copley Medal
The following table shows images and captions on the left, and alt text and captions on the right: the right column is what a visually impaired reader will hear. This table was computed from the copy of Copley Medal cached on 15 June 2013 at 16:47.
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The Copley Medal awarded to Mendeleev in 1905.
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John Theophilus Desaguliers, who won the medal three times, more than any other individual.
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