img that fits into a div

I want a background image that automatically fits the div size.

I have several div of the same class, each with different dimensions, is it possible to set the width and the 开发者_Go百科height of the image, exactly to the dimension of the div ?

Do you think is better to use img or background-image?

P.S I don't know if is it possible to set the dimension of the background image, of course is possible for the tag img, but if I use the tag img the image is separated from the content (it dosen't overlap as a background)

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Personally if you're going to modify things in this way, I think using img is better.

You can literally just set the height and width of the div if that's what you want.

<div class="box"><img src="Path/to/image.png"/></div>

and then the CSS would be something like this:

.box {
     height: 300px;
     width: 300px;
}

.box img {
     height: 300px;
     width: 300px;
}

That's one way of doing it anyway. You could also set it so that the height is 100% the size of the div, but the width is set to auto so that it scales with it. That way the image won't distort. Like this:

.box img {
     height: 300px;
     width: auto;
}

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You could try something like this

<div style="width:200px;height:200px">
    <img src="image.png" width="100%" height="100%"/>
</div>

With the background image, you'll not be able to resize the image to the exact dimensions of the div tag.