How to Create a CSS Opacity Gradient Using Masks?

CSS Opacity Gradient

The objective is to create a CSS-based effect resembling the provided example, where an overlay with a gradient is applied over a background with a dynamic color.

Using CSS Masks

In CSS, you can achieve this using masks. While browser support for this method is still limited, modern versions of Chrome, Safari, and Opera support the necessary properties (-webkit-mask-image and -webkit-mask-size amongst others).

The key is to create a mask that is a gradient itself, starting with complete opacity (visible) and ending with transparency (invisible). This will result in a gradient effect on the content beneath it.

Code Implementation

p {
  color: red;
  -webkit-mask-image: -webkit-gradient(linear,
    left top,
    left bottom,
    from(rgba(0,0,0,1)),
    to(rgba(0,0,0,0)));
}

Example Usage

This CSS can be applied to a paragraph element to display text with a gradient effect:

<p>This is a paragraph with a CSS opacity gradient.</p>

In this example, the text will be displayed in red within a gradient that fades from opaque at the left to transparent at the right. The transparency allows the background color to show through as you move to the right.

It's important to note that the color of the background element needs to be set in order to see the opacity gradient effect. In the provided example, the background color is lightblue:

  <p>This is a paragraph with a CSS opacity gradient.</p>

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