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Alternative text (or alt text) is text associated with an image that serves the same purpose and conveys the same essential information as the image. [1] In situations where the image is not available to the reader, perhaps because they have turned off images in their web browser or are using a screen reader due to a visual impairment, the alternative text ensures that no information or ...
A text-based web browser such as Lynx will display the alt text instead of the image (or will display the value attribute if the image is a clickable button). [13] A graphical browser typically will display only the image, and will display the alt text only if the user views the image's properties, or has configured the browser not to display ...
On pages with infobox images (see Christian Conventions infobox at the top as an example), the image from the infobox does show a tooltip with the alt text in IE8, while the other images in the article, which all have alt text, show nothing. A few days ago, IE8 with the option to expand alt text enabled, was showing text for all images.
This ensures that screen readers will read, and the mobile site will display, the image (and its textual alternative) in the correct section. This guideline includes alt text for LaTeX-formatted equations in <math> mode. See Wikipedia:Manual of Style/Mathematics § Alt text. Do not insert images in headings; this includes icons and <math ...
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 ...
Not every image needs a caption; some are simply decorative. Relatively few may be genuinely self-explanatory. In addition to a caption, alt text – for visually impaired readers – should be added to informative (but not purely decorative) images; [1] [2] [3] see Wikipedia:Alternative text for images.
The alt text for an imagemap region is always the same as its title text; the alt text for the overall image is given in the first line of the imagemap's markup. The underlying image's native dimensions are 3916 × 1980, and the coordinates are given in these dimensions rather than in the 300px resizing.
The approach to make Wikipedia accessible is based on the W3C's official WCAG 2.0 (a.k.a. ISO/IEC 40500:2012) and ATAG 2.0 guidelines. The guidelines provided by this accessibility project are merely an attempt to reword the WCAG 2.0 into a guideline hopefully easier to understand for editors who are not familiar with accessibility or web development.