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Access: [1.1.1.1]: <img> missing 'alt' text (Priority 1)

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Cause:

All images -- including transparent GIFs -- must have "alt" text (short for "alternate"). Alternate text describes the information in the image, which is useful for three important purposes:

Some user agents render the alt text as a tool-tip: the little yellow box that pops up when you hold your mouse cursor over the image.

Alternate text should be concise (i.e. 10-12 words maximum containing no more than 150 characters including spaces and punctuation). For transparent images and spacers, use alt="" (NULL), alt=" " (spaces are acceptable), or alt="blank". Any words depicted in the image should also appear in the "alt" text description.

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Example:

Good<img src="banana.jpg">
Good<img src="banana.jpg" alt="A picture of a banana.">
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Solution:

Add a concise (no more than 150 characters) description of the image as an alt attribute.

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References:

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