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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.
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 ...
Often the caption or article will describe the image adequately, and where this is the case you can write alt=caption or alt=see adjacent text. If additional alt text is added, it should be a succinct description that complies with the content policies; see WP:ALT for more information.
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 ...
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 ...
In other words, the "it is a link to further information" (i.e. a link to the file information page) is something all images have in common, but the alt-text for an image is part of the page (not the image) and helps to integrate the image into the page it is being used on (i.e. this image is being used here for this reason, and [where it helps ...
Free images that can be reused commercially and modified are preferred. Non-free images may sometimes be used, but only in certain circumstances. Wikimedia Commons accepts only free images, which can then be used by any of the other Wikimedia projects. To use an image in an article, insert: [[File:Image name.jpg|thumb|Caption for the image]].
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 ...