How to solve the problem of grandfather's background obstructing pseudo-elements when text gradient adds shadows?

Clever solution: Text gradient shadow conflicts with grandfather element background

In web design, it is very common to create text gradients and shadows using pseudo-elements, but sometimes you encounter the problem of grandfather elements occluding pseudo-elements in the background. This article will analyze this problem in depth and provide effective solutions.

First, let's look at a typical code example, which can implement text gradients and shadows:

<div class="header">
  <p class="text" data-text="示例文本">Sample text</p>
</div>

.header {
  width: 100%;
  height: 100px;
  /* Adding background color here will block pseudo-elements*/
  background-color: #f0f0f0; 
}

.text {
  -webkit-text-fill-color: transparent;
  background-image: linear-gradient(to bottom, red 0%, green 100%);
  -webkit-background-clip: text;
  background-clip: text;
  font-size: 40px;
  font-weight: bold;
  letter-spacing: 9px;
}

.text::before {
  content: attr(data-text);
  position: absolute;
  color: transparent;
  text-shadow: 0 4px 2px blue;
  z-index: -1; /* Negative z-index value is invalid*/
}

When adding background color to the .header element, pseudo-element ::before will be obscured. This is because of the stacking contextual nature of pseudo-elements. Simply put, although a pseudo-element is visually attached to the parent element, it is at the same level as other child elements of the parent element in the stacking order. Even if a negative z-index is set, it cannot be left behind the grandfather element background.

Solution: Adjust the stacking context

To solve this problem, we need to upgrade the cascaded context of the .text element and its pseudo-elements so that it is higher than the background of the grandfather element. Just simply add position: relative; and a positive z-index value to the .text element:

 .text {
  position: relative;
  z-index: 1; /* Improve the stacking order*/
  -webkit-text-fill-color: transparent;
  background-image: linear-gradient(to bottom, red 0%, green 100%);
  -webkit-background-clip: text;
  background-clip: text;
  font-size: 40px;
  font-weight: bold;
  letter-spacing: 9px;
}

With this modification, the .text element and its pseudo-element will be correctly rendered on the background of the grandfather element, thus solving the occlusion problem. This is a simple and effective solution without complex cascading context operations.

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