Use the CSS: read-write selector to select elements with no "readonly" attribute.
Example
You can try to run the following code to implement the: read-write selector
<!DOCTYPE html> <html> <head> <style> input:read-write { background-color: blue; color: white; } </style> </head> <body> <form> Subject: <input type = "text" name = "subject" value = "Java"><br> Student: <input type = "text" name = "student" readonly value = "Amit"><br> </form> </body> </html>