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问题:

<a href="index.html"><img src="image.png"/></a>

IE8 highlights the image with a blue border. I'm not sure what CSS is relevant here, is it just border? Can I use a single CSS style to turn it off, like:

a img {
  ...
}

回答1:

Use this css:

a img {
 border:none;
}

回答2:

Yes, you can:

a img { border: 0; }

You can use 0 for 0px width, or none for no border overall, same effect...they both work cross-browser.

回答3:

a img{
    border-width: 0;
}

Find further reference at https://developer.mozilla.org/en/CSS/border

I suggest you test your site in other browsers. In this case, you would have noticed that it's not an IE8 issue.

回答4:

Have you tried setting the image border to 0?

回答5:

You can also use this

<img height="20px" border="0" src="image.png" />

However Sarfaraz' answer above is a better approach.