The CSS & nesting selector explicitly states the relationship between parent and child rules when using CSS nesting. It makes the nested child rule selectors relative to the parent element. Without the & nesting selector, the child rule selector selects child elements. The child rule selectors have the same specificity weight as if they were within :is()....paragraph <a href="#">contains a link</a>, try hovering or focusing...paragraph <a href="#">contains a link</a>, try hovering or focusing...