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The alt attribute is used for short descriptions, with longer descriptions using the longdesc attribute. The standards organization for the World Wide Web, the World Wide Web Consortium (W3C), recommends that every image displayed through HTML have an alt attribute, though the alt attribute does not need to contain text. The lack of proper alt ...
Writing "|alt=" will cause the MediaWiki software to render HTML with an empty alt attribute in the img tag. When the image is a link, screen readers will read out the link filename (e.g., "slash green underscore tick") if the HTML alt attribute is empty or missing. Nearly all images in Wikipedia articles are links to the image description page ...
Text that provides the same essential information as an image in an article, provided by the alt attribute, image caption, and sometimes the body text. [6] Alt attribute The HTML attribute used on webpages to specify alternative text to be displayed in place of an element that cannot be rendered. [12] Alt parameter
A gallery displays several pictures in an array or similar layout. Galleries can display images formed into rows and columns by use of the <gallery>...</gallery> parser (conversion of Wikitext to HTML) tag. Be aware that different screen size and browsers may affect accessibility for some readers.
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.
If the alt parameter is specified in the Image tag, that's what appears as the ALT text in the HTML, as you can verify by clicking on "View HTML source" in your browser. If the alt parameter is not specified in the Image tag, the HTML alt text is the empty string by default. This is new behavior for the Image and math tags.
Also, if you add "alt=" to image markup, the screen reader acts as if you never specified the alt attribute. Graham 87 08:24, 21 March 2010 (UTC) 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 ...
Images Whenever an image is linked, Google will use the "alt" attribute as the anchor text. Empty Whenever an image is linked, and the "alt" attribute is empty. Latent semantic indexing Latent semantic indexing (LSI) is a method used by Google to determine similar keywords.