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<!DOCTYPE html> <html> <body> <p> <a href="../html/default.html">HTML</a><br> <a href="../css/default.html">CSS</a> </p> <p>Click the button to add a red border to the first link in the document.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.links[0].style.border = "5px solid red"; } </script> </body> </html>