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An example of alt attribute text being displayed in place of an unavailable image, with the underlying HTML displayed below it The Wikipedia article for Wolf on the Lynx web browser, displaying the text of the alt attribute in orange in place of the images. The text in the alt attribute is used to replace the image when the image cannot be ...
The actual alt text for the displayed image will be one of the following, in order of preference: The explicitly requested Alt, if any; The explicitly requested Caption, if the image type has no visible caption; The empty string, if there is an explicitly requested Caption and the image type has a visible caption.
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 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 base image has alt text "1896 Democratic campaign poster". The left circle has alt text "William J. Bryan". The right circle has alt text "Arthur Sewall". The blue (i) has alt text "About this image". All these are repeated as link title text, which provides a tooltip in some browsers, with the exception of the base image, which has link ...
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 thumb tag automatically allows the image to be enlarged and positions it (floats) automatically to the right of the page. An enlarge icon is placed in the lower right corner. See note below about adding an alt tag; This is the basic markup for most images
The page currently says that purely decorative images should have no alt text, and that's not correct because a screen reader that sees an image without an alt attribute will read the filename of the image. All images should have alt text and if the image serves no purpose, then it should have alt text of "".
Alt text is written in context. For example, if one image's alt text explains that a pickel helmet is a spiked helmet in the old Prussian style, another image in the same article can use "pickel helmet" in its alt text without bothering to explain what a pickel helmet is. (I just ran across this example in Unification of Germany). I think it'd ...