Title

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<img src="#" alt="..." title="..." width="..." height="..." />

As with the alt text attribute, you should also get in the habit of always including a title attribute, which is title="". Most browsers will display this text as a tooltip when a user hovers their mouse over am image with the included attribute.

IMPORTANT: The alt and/or title attributes will also be used by some browsers in the case where the image itself cannot load.