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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>closest Example</title> </head> <body> <div class="outer"> <div class="inner" id="child">Click to change parent</div> </div> <button onclick="highlightParent()">Highlight Parent</button> <script> function highlightParent() { const element = document.getElementById('child'); const parent = element.closest('.outer'); parent.style.border = '2px solid red'; } </script> </body> </html>