Редактирование кода:
См Результат »
Попробуй сам - ©
w3ii.com
<!DOCTYPE html> <html> <body> <p>This example demonstrates how to assign an "onfocus" event to an input element.</p> Enter your name: <input type="text" id="fname" onfocus="myFunction()"> <script> function myFunction() { document.getElementById("fname").style.backgroundColor = "red"; } </script> </body> </html>