Is There a CSS :blur Pseudo-class for Styling Elements Out of Focus?

Exploring the Absence of the :blur Selector in CSS

While the :focus pseudo-class is commonly used in CSS to style elements in focus, the question arises whether there exists a corresponding :blur pseudo-class.

Answering the Question

Contrary to popular belief, CSS does not include a :blur pseudo-class. This is because CSS pseudo-classes represent states, not events or transitions between states. In this case, :focus represents an element in focus, but there is no pseudo-class for an element losing focus.

Understanding the Limitations of :focus and :hover

Similarly, there is no :mouseover or :mouseout pseudo-class. These pseudo-classes represent elements with a pointing device hovering over them or not, but CSS cannot capture the events of entering or leaving the hovering state.

Alternative Approaches

If you wish to apply styles to elements without focus, employ one of these methods:

1. Negation with :not():

input:not(:focus), button:not(:focus) {
    /* Styles for unfocused inputs and buttons */
}

2. Overriding with :focus:

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

input:focus, button:focus {
    /* Styles for focused inputs and buttons */
}

By understanding this limitation, developers can effectively manage styles and avoid unnecessary dependencies on elusive pseudo-classes.

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