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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 ...
The World Wide Web Consortium (W3C) guidelines state that an image's alt attribute should convey meaning, rather than a literal description of the image itself. [2] 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.
The W3C's web content accessibility guidelines state that the alt attribute is used to convey the meaning and intent of the image, rather than being a literal description of the image itself. [9] For example, an alt attribute for an image of an institution's logo should convey that it is the institution's logo rather than describing details of ...
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:
An image description is a form of text-based description referring to the characteristics of an image. Alt text presents visual information via text (usually encoded in HTML code), primarily to aid blind people using screen readers so they may have access and interact with the visual.
When a file such as an image, video or sound clip is uploaded to Wikipedia or the Wikimedia Commons, an associated file description page is created (also known as an image description page or file page). The purpose of these pages is to provide information about the file: for example the author, date of creation, who uploaded the file, any ...
In the case of Main Page images, the alt text is automatically made exactly the same as the image title, so where the latter is descriptive enough, there's no need for additional alt text. If the alt text provided is different from the caption, the screen reader will typically read the alt text and not the caption.
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.