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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 the image filename when no alt text is available.
The base image has alt text "1896 Democratic campaign poster". The left circle has alt text "William J. Bryan". The right circle has alt text "Arthur Sewall". The blue (i) has alt text "About this image". All these are repeated as link title text, which provides a tooltip in some browsers, with the exception of the base image, which has link ...
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 ...
Alt text is intended for visually impaired readers. 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
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.
Align the top of the image to the top of the text. This is often a bit higher than the top of a capital letter, because of ascenders in letters like lower-case "h". [[File:Flag of Hungary vertical.svg| text-top |20px|link=|alt=]] Align the bottom of the image to the bottom of the text.
If Wikipedia and Wikimedia Commons both have an image with the specified name, the Wikipedia version is the one that will appear in the article. thumb is required in most cases; alt=A white dog in a harness playfully nuzzles a young boy. Alt text is meant for those who cannot see the image; unlike the caption, it summarizes the image's appearance.
The page currently says that purely decorative images should have no alt text, and that's not correct because a screen reader that sees an image without an alt attribute will read the filename of the image. All images should have alt text and if the image serves no purpose, then it should have alt text of "".