Using alt-text with headlines

These three headlines below look identical with graphics enabled. The first one doesn't have an alt-text, and will not be displayed at all without graphics. The second has put the headline image in an ordinary paragraph, and the headline will not appear as a headline, the third image has put the headline image in a headline element (<h3>) and it will be displayed as such in Opera and newer Netscape, if not in IE.

Headline image without an alt-text

Code: <p><img /></p>:

Headline image with an alt-text

Code: <p><img alt="An Image Headline" /></p>:

Headline image with an alt-text in a headline tag

Code: <h1><img alt="An Image Headline" /></h1 >:

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