Tips for applying a linear gradient mask to div elements?

I'm attempting to create a fading effect on the edges of a div by using two overlay divs positioned absolutely on either side. My goal is to have the background of the page visible once the fade is complete, effectively masking the content of one div with linear 'fade' gradients from the other two divs. Please refer to the diagram below for a clearer explanation...

Here are the methods I've experimented with:

  • Using the -webkit-mask property with a linear gradient. While it works in Webkit, the result is choppy and not smooth when combined with the mask property.
  • Experimenting with an SVG gradient mask (like the one showcased in the Firefox / MDN demo). It works well in Firefox but not in Chrome where the quality of the gradient is lacking compared to -webkit-mask / linear-gradient.
  • Employing a transparent GIF or PNG for masking. However, in practice, the masking color tends to show through as seen in this example on Stack Overflow.

I'm open to other suggestions or alternative layouts that could help me achieve the same visual effect. Any ideas?

htmlcssmasking

Answer №1

When considering the best approach for your project, it seems that utilizing a transparent PNG with an absolute position and higher z-index inside a container div could be most effective. This container div would overlay the sliding background image. To achieve this effect, you may want to use a small 2px slice repeated along the y-axis.

I experimented with a similar technique using a tiny slice of a radiant pattern repeated vertically (y-axis), and found that the underlying image scrolled through the top transparent layers as intended. If my understanding aligns with your objectives, I can provide you with the following example CSS code:

#container {
background-attachment: scroll;
background-image: url(Untitled-1.jpg);
background-repeat: repeat-x;
clear: both;
float: left;
height: 768px;
width: 80000px;
position: relative;
}
#container #info {
float: left;
width: 630px;
margin-right: 20%;
margin-left: 20%;
position: fixed;
margin-top: 100px;
height: 519px;
clear: both;
clip: rect(100px,auto,auto,auto);
 }
#container #info #l_side {
background-image: url(left_.png);
background-repeat: repeat-y;
float: left;
height: 519px;
width: 165px;
position: relative;
margin-right: -2px;
}
#container #info #content {
background-color: rgba(0, 0, 255, 0.56);
color: rgba(0, 0, 255, 0.56);
float: left;
height: 519px;
width: 300px;
position: relative;
}
#container #info #r_side {
background-image: url(Right.png);
background-repeat: repeat-y;
float: left;
height: 519px;
width: 165px;
position: relative;
margin-left: -1px;
}

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