Answer
A CSS selector is a pattern that matches elements in a document tree. • Selectors connect a group of declarations to matching elements. • A selector can test element names, classes, IDs, attributes, states, and relationships. • If no element matches, the rule simply applies to nothing.
💡 Simple Example
article > h2 {
margin-block-start: 0;
}
⚡ Quick Revision
A selector chooses which elements receive a CSS rule.