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The alt attribute is the HTML attribute used in HTML and XHTML documents to specify alternative text (alt text) that is to be displayed in place of an element that cannot be rendered. The alt attribute is used for short descriptions, with longer descriptions using the longdesc attribute .
The alternative text serves the same purpose as the image. [1] On the web, alt text is supplied through the alt attribute. 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]
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 ...
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.
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:
For specifying no alt text the HTML syntax is alt="" or alt=" "(note the space), since MediaWiki will display the default alt text if it is empty or null we need to use |alt= (HTML escape code for a space). However this was rejected at the time since one screen reader (Orca) would read the link title attribute (the tooltip) instead.
Where the caption does not describe or identify the image, but the image is merely decorative, the alt text should contain the shortest possible description or identification of the image. I can see no place at all for captions on merely decorative images - and [ H67 ] tells us that decorative images should have null alt text ( |alt="" ).
Detailed image descriptions, where not appropriate for an article, should be placed on the image's description page, with a note saying that activating the image link will lead to a more detailed description. Avoid using images in place of tables or charts. Where possible, any charts or diagrams should have a text equivalent or should be well ...