How Does Opacity Inheritance Affect Backgrounds and Their Children in CSS?

Opacity Inheritance in CSS Backgrounds

In CSS, the opacity property controls the transparency of an element. When applied to a background element, it affects the transparency of both the background and its contained elements.

This behavior arises from the way that opacity is calculated in CSS. Opacity is a multiplicative property, meaning that it is applied at each level in the DOM tree. In the example provided, the background element has an opacity of 0.4, which means that its transparency is reduced by 40%.

However, the child element also has an opacity of 1.0, indicating that it is fully opaque. Since opacity is multiplicative, the final opacity of the child element is 0.4 * 1.0 = 0.4. This means that the child element's text also appears with an opacity of 0.4.

To achieve the desired effect of having a translucent background with fully opaque text, there are a few options:

• Use a Translucent PNG File: PNG images support transparency, so using a translucent PNG as the background image allows specifying the background's opacity separately from the text's opacity.
• Use an RGBA Color: RGBA colors include a fourth alpha channel that controls transparency. By setting the alpha channel to a value between 0 and 1, you can create a translucent background color.

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