Is There a `:blur` Selector in CSS?

CSS :blur Selector: An In-Depth Explanation

While the :focus selector is widely known, the concept of a :blur selector may not be immediately apparent. Here's a thorough exploration of the existence and limitations of this selector in CSS.

Is there a :blur selector in CSS?

Contrary to expectations, there is no dedicated :blur pseudo-class in CSS.

Why not?

Pseudo-classes, including :focus, represent states of elements. They do not capture events or transitions between states. Therefore, a :blur pseudo-class that specifically denotes an element losing focus does not exist.

Alternatives for Handling Non-Focused Elements

When styling elements that are not in focus, you have two main approaches:

• Using :not(:focus): This technique works effectively but has limited browser support.

input:not(:focus), button:not(:focus) {
/* Styles for form inputs and buttons that do not have focus */
}

• Declaring Generic Rules with Specific Overrides: In this approach, you begin with a generic rule that applies to all elements, followed by a specific override for focused elements.

input, button {
/* Styles for all form inputs and buttons */
}

input:focus, button:focus {
/* Styles for form inputs and buttons that have focus */
}

Conclusion

Although there is no :blur selector, CSS provides flexible mechanisms to style elements both in focus and non-focus states. Understanding these techniques enables you to effectively control the appearance of elements based on their interaction states.

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