How to Store Inherit Value Inside a CSS Variable (aka Custom Property)?
Scenario
Consider the following CSS code:
:root { --color: rgba(20, 20, 20, 0.5); } .box { width: 50px; height: 50px; display: inline-block; margin-right: 30px; border-radius: 50%; position: relative; } .red { background: rgba(255, 0, 0, 0.5); } .blue { background: rgba(0, 255, 0, 0.5); } .box:before { content: ""; position: absolute; top: 0; left: 0; right: 0; bottom: 0; border-radius: 50%; transform: translateX(30px); background: var(--color); filter: invert(1); }
In this code, we use --color to control the background of the .box element's pseudo-element. However, we may encounter a situation where we desire to inherit the color from the parent .box element.
CSS Variable Inheritance Challenge
In CSS, the inherit keyword is not supported as a value for CSS variables. This means we cannot directly set --color to inherit to achieve our desired effect.
Solution: Using Fallback Value and Initial Value
To overcome this limitation, we can employ two techniques:
1. Using Fallback Value:
By utilizing the fallback value in CSS variables, we can tell the property to use inherit if --color is not explicitly defined.
background: var(--color, inherit);
However, in this case, because --color is always defined at the root level and inherited, the fallback value will never be used.
2. Using Initial Value:
We can employ the initial value to "undefine" --color and force the use of the fallback value. As per the CSS specification, the initial value is an empty value, which has a special interaction with var().
.box:before { ... background: var(--color, inherit); ... } .box { ... --color: initial; }
With this modification, we can achieve inherit value inheritance within the CSS variable, enabling us to control the background color based on the parent element's color.
<div class="box red"></div>
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