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The alt attribute is the HTML attribute used in HTML and XHTML documents to specify alternative text (alt text) that is to be displayed in place of an element that cannot be rendered. The alt attribute is used for short descriptions, with longer descriptions using the longdesc attribute .
Absent or unhelpful alternative text can be a source of frustration for visually impaired users. [2] On Wikipedia, alternative text is typically supplied through a combination of the image caption and the text supplied for the image alt parameter in the MediaWiki markup. The following example produces the adjacent image:
For example, the alt attribute on an institution's logo should convey that it is the institution's logo instead of describing details of what the logo looks like. [3] [4] On Wikipedia, alt text is provided in the alt parameter in the MediaWiki markup. Many templates, like {}, have parameters for specifying alt text. For images that link to ...
Zero or more of these options may be specified to control the alt text, link title, and caption for the image. Captions may contain embedded wiki markup, such as links or formatting. See Wikipedia:Captions for discussion of appropriate caption text. See Wikipedia:Alternative text for images for discussion of appropriate alt text. Internet ...
There is merit in having an examples/how-to page for alt text. Some of the examples from the earlier version of this guideline, showing how to do table-based timelines or template-based galleries or chemical formulae could go there. The extended image syntax section on alt text could be expanded in such a page.
[[File:Example.png|thumb| upright |alt=Example alt text|Example caption]] Adjust a thumbnail's size to Factor times the default thumbnail size, rounding the result to the nearest multiple of 10. For instance, "upright=1.5" makes the image larger, which is useful for maps or schematics that need to be larger to be readable.
The page is titled "Alternative text for images". The focus should be on alt text examples and how to properly write alt text, not on what alt text sounds like in screen readers, and I disagree that they were difficult to apply, the more examples you have to learn from the easier it is, at least for me. -- œ ™ 22:26, 31 December 2010 (UTC)
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