Glossary Term
Document.querySelector()
The Document method querySelector() returns the first Element within the document that matches the specified CSS selector, or group of CSS selectors. If no matches are found, null is returned.
The matching is done using depth-first pre-order traversal of the document’s nodes starting with the first element in the document’s markup and iterating through sequential nodes by order of the number of child nodes.
If the specified selector matches an ID that is incorrectly used more than once in the document, the first element with that ID is returned.
CSS pseudo-elements will never return any elements.
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