@rubeus: I disagree, the alt definition is as follows:
Quote:
The required alt attribute specifies an alternate text for an image, if the image cannot be displayed.
The alt attribute provides alternative information for an image if a user for some reason cannot view it (because of slow connection, an error in the src attribute, or if the user uses a screen reader).
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The alt should always be a descriptive text, it should tell the user what is in the image. This is so when a blind person uses a screen reader for example he will understand what that picture is about and not be read a file name, if the alt is empty the reader will simply skip it.
When people make an ePub they go through the process of reviewing it and when they finish working on it, most of the time more than one people review that work so the chances an image will not load are slim to none, so in an ePub case, alt is mostly for screen readers and not in a case where an image is not loaded because someone erased it from the server.