The -webkit-linear-gradient effect can lead to noticeable banding issues on Chrome and Safari browsers

The title pretty much sums it up. The first image below is a screenshot of a page that is about 8000 pixels tall, taken in the most recent version of Chrome:

On the other hand, this image depicts a different page (with the same CSS), which is only about 800 pixels tall:

And here is the accompanying code snippet:

  body{ 
     background-color: #f3ffff;
     margin:0px;
     background-image: url('/media/flourish.png'),
        -webkit-linear-gradient(
            top, 
           rgba(99, 173, 241, 1) 0px, 
           rgba(0, 255, 255, 0) 250px
        );

     background-image: url('/media/flourish.png'), 
        -moz-linear-gradient(
           top, 
           rgba(99, 173, 241, 1) 0px, 
           rgba(0, 255, 255, 0) 250px
        );


     background-image: url('/media/flourish.png'), 
        -o-linear-gradient(
           top, 
           rgba(99, 173, 241, 1) 0px, 
           rgba(0, 255, 255, 0) 250px
        );
     background-position: center top, center top;
     background-repeat: no-repeat, repeat-x;
     -ms-filter: "progid:DXImageTransform.Microsoft.gradient(GradientType=0, startColorstr='#63ADF1', endColorstr='#00000000')";
  }

The gradient is supposed to stop at 250px from the top of the page. It's peculiar how the banding effect seems to be influenced by the overall height of the page: pages with heights between 800px and 8000px exhibit smaller bands compared to the first example but still visible.

Interestingly, I used to utilize -webkit-gradient('linear'...) before, and it didn't have the same issue. I switched to -webkit-linear-gradient to align with my -moz and -o gradients.

I haven't tested this on Safari yet, but the provided code works well on Firefox and somewhat on Opera (colors are off, but the gradient remains smooth). As for IE, I've given up hope.

Has anyone encountered a similar problem?

Update: This also occurs on my Mac's Chrome/Safari, albeit the bands are approximately one-third the size shown in the uppermost image for the exact same page. The banding looks identical on both OSX Chrome and OSX Safari.

Although one-third the size is noticeable, it's not as jarring. The actual page can be found at if you wish to see it in a different browser. The CSS is inline and compiled using less.js in-browser.

google-chromecss

Answer №1

Seems to be a bug specific to webkit browsers. I have devised a workaround solution below, which has been tested on the latest versions of Chrome and Firefox. Essentially, you will need to position a div containing the background behind your main content. Additionally, I've included some extra styles to ensure compatibility with Internet Explorer.

Consider the following HTML structure:

<html lang="en">
<head>
    <style>
        ...
    </style>
</head>
<body>
    <div class="background">bgdiv</div>
    <div class="content_pane">
        <div class="titlebar">Leave a Comment!</div>
        <div class="comment">Your Comment.</div>
    </div>
</body>
</html>

Coupled with the following stylesheet:

    body{
        background-color: #f3ffff;
        min-height: 100%;
        margin:0px;
    }
    .background {
        height: 250px;
        left: 0;
        position: absolute;  
        right: 0;
        top: 0;
        z-index: -10;

        /* Background gradients for different browsers */
        
        background-image:
            linear-gradient(top,
                rgba(99,173,241,1) 0%,
                rgba(0,255,255,0) 250px
            ); 
        background-position: center top, center top;
        background-repeat: no-repeat, repeat-x;
    }
    .content_pane {
        background: white;
        border: 1px solid grey;
        font-family: arial, sans;
        font-weight: bold;
        margin: 6em auto 5em;
        width: 50%;
    }
    .titlebar {
        background: #3f7cdb;
        color: white;
        font-family: arial, sans;
        padding: .25em 2ex .25em;
    }
    .comment {
        padding: 1em;
    }

When rendered, the output should look like this, irrespective of window size:

Answer №2

Although the demo link provided may not be functioning, I conducted some tests and found that it worked perfectly for me in Chrome when I applied a width/height of 100% to the body/html elements as demonstrated below:

body, html {
    width:100%;
    height:100%;
}

Check out the Demo here.

You can also create a header/logo element where you define the initial gradient and then seamlessly blend in the ending gradient within the body of your css like this:

CSS

body, html {
    width:100%;
    height:100%;
    margin:0;
    padding:0;
}

body {
    background-color: #f3ffff;
    margin:0px;
    height:10000px;
}

.header {
    height:300px;
    width:100%;
    background-image: url('http://cdn1.iconfinder.com/data/icons/stuttgart/32/premium.png'),
    -webkit-linear-gradient(top, rgba(99, 173, 241, 1), rgba(0, 255, 255, 0));

    background-image: url('http://cdn1.iconfinder.com/data/icons/stuttgart/32/premium.png'),
    background-image: -webkit-gradient(linear, left top, left bottom, from(#444444), to(#999999)); 

    background-image: url('http://cdn1.iconfinder.com/data/icons/stuttgart/32/premium.png'), 
    -moz-linear-gradient(top, rgba(99, 173, 241, 1) 0px, rgba(0, 255, 255, 0) 250px
    );

    background-image: url('http://cdn1.iconfinder.com/data/icons/stuttgart/32/premium.png'), 
    -o-linear-gradient(top, rgba(99, 173, 241, 1) 0px, rgba(0, 255, 255, 0) 250px);
    background-position: center top, center top;
    background-repeat: no-repeat, repeat-x;
    background-size:auto;
    -ms-filter: "progid:DXImageTransform.Microsoft.gradient(GradientType=0, startColorstr='#63ADF1', endColorstr='#00000000')";
}

HTML

<div class="header">
    content
</div>

View Demo here.

Friendly reminder: If you encounter any issues, feel free to refer to this example showcasing the problem on Chrome: Issue Link

Answer №3

It appears that there are some glitches in Chrome when using rgba() values. I conducted an experiment with regular hex values and it seems to have resolved the issue for me.

If you're experiencing the same problem, check out this link to see if it helps you too.

Update:

Upon further investigation, it seems like the issue is related to the 250px limit, as it only arises when that parameter is configured.

I couldn't find a more optimal solution than implementing this method.

The workaround involves overlaying a div with your preferred gradient, set at a height of 250px. This allows the page to extend infinitely while maintaining the aforementioned height restriction on the div.

Answer №4

When it comes to rendering in Webkit, both -webkit-gradient('linear'...) and webkit-linear-gradient are handled in the same manner. The issue arises when dealing with multiple backgrounds. I encountered a similar problem where two different elements ended up overlapping each other, requiring separate backgrounds for each one. It looked something like this:

<body>
 <div class="body-overlay"></div>
</body>

In terms of CSS:

body{-webkit-linear-gradient(...)}
    .body-overlay{background:url('blah.png')}

I believe this issue occurs due to the fixed dimensions of the image.

Answer №5

Instead of relying on background-image, consider utilizing this method with CSS:

 background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#63adf1), color-stop(53%,#ffffff), color-stop(100%,#ffffff)); /* Experiment with the % values to achieve your desired effect */

It is recommended to always use hex values for colors. However, from a UX perspective, it may be more beneficial to utilize an actual image (since you are already loading an image) to avoid any cross-browser compatibility issues.

Answer №6

Have you experimented with using 

background-size: auto, 250px 250px;
— utilizing auto for the initial image and setting the gradient to 250px.

If the gradient image doesn't need to cover the entire page, it's advisable to limit its size. This not only helps prevent rendering issues with large images but also enhances browser performance.

For a visual representation, check out this example at http://jsfiddle.net/kizu/phPSb/ (although I couldn't replicate the issue).

Answer №7

When facing unfamiliar circumstances, consider implementing:

transform: translateZ(10px);

Answer №8

One issue I encountered was with the height of the body element. To address this, consider implementing the code snippet below:

body {
    width:100vw;
    height:100vh;
    ...
}

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