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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]
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 ...
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 ...
Zero or more of these options may be specified to control the alt text, link title, and caption for the image. Captions may contain embedded wiki markup, such as links or formatting. See Wikipedia:Captions for discussion of appropriate caption text. See Wikipedia:Alternative text for images for discussion of appropriate alt text. Internet ...
The code alt="" with two quotes produces an alt text with two quotes. The code "alt=" (without the quotes) is exactly the same as not specifying the alt text at all. The problem is that alt text is needed when an image contains a link, but some images don't really need alt text because the captions are informative enough.
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.
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="" ).
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.