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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 ...
Many templates, like {}, have parameters for specifying alt text. For images that link to their description page (most images on Wikipedia), the alt parameter should not be blank, nor should the alt parameter be absent. A screen reader will default to reading out the image filename when no alt text is available.
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.
Otherwise, (if the image type is unspecified or is "frameless"), this text is used for the link title provided the link has not been suppressed with "|link=", and also for the alt text provided an explicit alt=Alt has not been supplied. The actual alt text for the displayed image will be one of the following, in order of preference:
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.
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The Alt codes had become so well known and memorized by users that Microsoft decided to preserve them in Microsoft Windows, even though the OS features a newer and different set of code pages, such as CP1252. Windows includes the following processing algorithm for Alt code, which supports both methods: