[html] Can I style an image's ALT text with CSS?

You cant style the alt attribute directly in css. However the alt will inherit the styles of the item the alt is on or what is inherited by its parent:

_x000D_
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    <div style="background-color:black; height: 50px; width: 50px; color:white;">_x000D_
    <img src="ouch" alt="here i am"/>_x000D_
    <div>
_x000D_
_x000D_
_x000D_

In the above example, the alt text will be black. However with the color:white the alt text is white.