Is it possible to graduate the opacity of an HTML element?

Question

I want a

element (the whole element, contents and everything) to fade out towards the bottom. It\'s to truncate a news post that has to fit into a v

Answer 1

It is possible, without specifing an height for the container.

Check this working demo, and try to add/remove contents from #contents

HTML

    

        Some contents goes here
    
    

    

CSS

#container {
    position:relative;
}
#contents {
    background:red;
}
#gradient {
    position:absolute;
    z-index:2;
    right:0; bottom:0; left:0;
    height:200px; /* adjust it to your needs */
    background: url(data:image/svg+xml;base64,alotofcodehere);
    background: -moz-linear-gradient(top,  rgba(255,255,255,0) 0%, rgba(255,255,255,1) 70%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,0)), color-stop(70%,rgba(255,255,255,1)));
    background: -webkit-linear-gradient(top,  rgba(255,255,255,0) 0%,rgba(255,255,255,1) 70%);
    background: -o-linear-gradient(top,  rgba(255,255,255,0) 0%,rgba(255,255,255,1) 70%);
    background: -ms-linear-gradient(top,  rgba(255,255,255,0) 0%,rgba(255,255,255,1) 70%);
    background: linear-gradient(to bottom,  rgba(255,255,255,0) 0%,rgba(255,255,255,1) 70%);
}​

This will work almost in any browser which supports opacity (including IE9), and here's the IE8 "rgba" fallback (untested):

filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00ffffff', endColorstr='#ffffff',GradientType=0 );

To generate your own gradient, visit Colorzilla.

The first stop (0%) must have opacity 0 ( rgba(255,255,255,0); ), then around 70% - do some tests to find what's good for you - add another stop with opacity 1 ( rgba(255,255,255,1); ).

You've to know the background of the page/container to make it work obviously...

​