Alt text is the line of text you see pop up (in Internet Explorer, see note below) when you place your cursor over an image. It also displays a text representation of the image when the user has images turned off in their browser (this is the intended behavior). It is highly recommended that you utilize this area as it is required under accessibility laws and, is indexed by the search engines.
Note: Internet Explorer (IE) will display alt text when you hover your cursor over an element that utilizes the alt attribute. This is incorrect behavior as the alt text is designed to be displayed when the user has their images turned off while browsing. Other browsers such as Opera and Mozilla will not display the alt text on hover.
The alt attribute should not to be stuffed with keywords or phrases. The alt text should mirror the content of the image. If it is a graphic header, then your alt attribute should mirror the text in the graphic header.
Alternative text values should not exceed 80 characters in length. If more than 70-80 characters are required one should use the longdesc attribute as an alternative to alt text.
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