What is the protocol for displaying linear gradients that overlap?

My objective is to create a unique cutting corner effect using linear gradients. Achieving this on one corner is straightforward:

body {
  background: #eac996;
}

.box {
  width: 100px;
  height: 100px;
  margin: 100px auto;
  padding: 20px;
  background-color: #fff;
  background: -webkit-linear-gradient(45deg, transparent 10px, #fff 10px);
  background: -moz-linear-gradient(45deg, transparent 10px, #fff 10px);
  background: -o-linear-gradient(45deg, transparent 10px, #fff 10px);
}
<div class="box"></div>

I attempted to extend the same styling to the other three corners but did not achieve the desired outcome.

body {
  background: #eac996;
}

.box {
  width: 100px;
  height: 100px;
  margin: 100px auto;
  padding: 20px;
  background-color: #fff;
  background:
    -webkit-linear-gradient(45deg, transparent 10px, #fff 10px),
    -webkit-linear-gradient(135deg, transparent 10px, #fff 10px),
    -webkit-linear-gradient(225deg, transparent 10px, #fff 10px),
    -webkit-linear-gradient(315deg, transparent 10px, #fff 10px);
  background:
    -moz-linear-gradient(45deg, transparent 10px, #fff 10px),
    -moz-linear-gradient(135deg, transparent 10px, #fff 10px),
    -moz-linear-gradient(225deg, transparent 10px, #fff 10px),
    -moz-linear-gradient(315deg, transparent 10px, #fff 10px);
  background:
    -o-linear-gradient(45deg, transparent 10px, #fff 10px),
    -o-linear-gradient(135deg, transparent 10px, #fff 10px),
    -o-linear-gradient(225deg, transparent 10px, #fff 10px),
    -o-linear-gradient(315deg, transparent 10px, #fff 10px);
}
<div class="box"></div>

To address this, it is crucial to prevent the overlap of linear gradients by positioning them strategically as shown below:

body {
  background: #eac996;
}

.box {
  width: 100px;
  height: 100px;
  margin: 100px auto;
  padding: 20px;
  background-color: #fff;
  background:
    -webkit-linear-gradient(45deg, transparent 10px, #fff 10px),
    -webkit-linear-gradient(135deg, transparent 10px, #fff 10px),
    -webkit-linear-gradient(225deg, transparent 10px, #fff 10px),
    -webkit-linear-gradient(315deg, transparent 10px, #fff 10px);
  background:
    -moz-linear-gradient(45deg, transparent 10px, #fff 10px),
    -moz-linear-gradient(135deg, transparent 10px, #fff 10px),
    -moz-linear-gradient(225deg, transparent 10px, #fff 10px),
    -moz-linear-gradient(315deg, transparent 10px, #fff 10px);
  background:
    -o-linear-gradient(45deg, transparent 10px, #fff 10px),
    -o-linear-gradient(135deg, transparent 10px, #fff 10px),
    -o-linear-gradient(225deg, transparent 10px, #fff 10px),
    -o-linear-gradient(315deg, transparent 10px, #fff 10px);
  background-position:
    bottom left,
    bottom right,
    top right,
    top left;
  background-size: 50% 50%;
  background-repeat: no-repeat;
}
<div class="box"></div>

I am curious about the browser rendering rules when linear gradients overlap. Any references to specifications or further insights on this topic would be greatly appreciated.

Answer №1

If you're discussing the layering of multiple gradients, with comma-separated values in each declaration, then the order is front-to-back. It may seem contrary to the cascading order definition and how source-ordered elements stack at the same level, but that's how the background layers are defined.

The layering order isn't crucial here because the colored regions of each gradient will overlap regardless. To prevent this, you must include background-position and background-size declarations to avoid overlapping, as gradients lack intrinsic size, causing them to scale automatically to cover the entire box.

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