CSS :where() you don’t need it

What is the point of this code I found?

O:where(.for) art thou CSS? – William Sasspeare
// Is this like cat abuse?
footer.wp-block-template-part {
	:where(.wp-block-group.has-background) {
		padding: 0 2.375em;
	}
}
// Should be this
footer.wp-block-template-part {
	.wp-block-group.has-background {
		padding: 0 2.375em;
	}
}


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