Page attribute missing!

Do not edit the Twenty Twelve theme. It is the current default WordPress theme and having access to an original, unedited, copy of the theme is vital in many situations. First create a child theme for your changes. Or install a custom CSS plugin.

yes that is what i am doing. on that child theme the page attribute is missing though!

Then I can only assume that there is an issue in your child theme. Try checking your site’s error logs for error messages. Your hosts should be able to help you in accessing your site’s error logs.