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=".
Electronic music
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 Electronic music cached on 21 May 2013 at 22:17.
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Telharmonium, Thaddeus Cahill, 1897
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Halim El-Dabh at a Cleveland festival in 2009.
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Karlheinz Stockhausen in the Electronic Music Studio of WDR, Cologne, in 1991
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 | Ambox ?.svg
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Israeli composer Josef Tal at the Electronic Music Studio in Jerusalem (~1965). On the right, Hugh Le Caine's sound synthesizer the Special Purpose Tape Recorder.
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Keith Emerson performing in St. Petersburg in 2008
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 | Gnome-searchtool.svg
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| Gnome-searchtool.svg
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Qlimax, a large electronic music event that occurs each year in the Netherlands, celebrating the Hardstyle subgenre of electronic music
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Probing for "bends" using a jeweler's screwdriver and alligator clips.
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 | Portal icon
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 | Magnetic tape.
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