Is There a CSS :blur Selector, and How Can I Style Elements When They Lose Focus?

CSS Focus and Blur States

In CSS, you can use the :focus selector to apply styles to an element that has focus. However, there is no :blur selector to represent an element that has lost focus.

Dynamic Pseudo-Classes and Element States

Dynamic pseudo-classes, including :focus and :hover, represent states of elements, not events or transitions between states. Therefore, there is no :blur selector to indicate an element that has just lost focus.

Applying Styles without a :blur Selector

To apply styles to elements that are not in focus, you can use either of these methods:

• Use :not(:focus) (with limited browser support):

input:not(:focus), button:not(:focus) {
    /* Styles for non-focused form inputs and buttons */
}

• Override default styles for focused elements:

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

input:focus, button:focus {
    /* Override styles for focused form inputs and buttons */
}

Conclusion

While CSS does not have a dedicated :blur selector, you can use these techniques to apply styles based on an element's focus state.

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