问题:

I have the following code but my image won't resize, how come? Does the image need to be bigger?

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
 <meta content="text/html; charset=ISO-8859-1"
 http-equiv="content-type">
 <title>blah</title>
 <style type="text/css" media="screen, print, projection">

img#background {     
    position: absolute;     
    top: 0;     
    left: 0;     
    width: 100%     
    height: 100%; 
} 

</style> 
</head>
<body>
<img id="background" src="greenbackground.png" alt="Background Image" />



</body>
</html>

回答1:

You also need this:

html, body{
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}
img#background {     
    position: absolute;     
    top: 0;     
    left: 0;     
    width: 100%;  
    height: 100%; 
    margin:0;
    padding:0;
}

Note, using css3 you can do this:

body{
    background:url(...) no-repeat;
    background-size: 100%;
}

Edit: Missed a ;

Demo:

http://jsfiddle.net/jJT45/

回答2:

You're setting it to 100%, but 100% of what? Try giving the body the same 100% height and width properties and see what happens.

resizable background image

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