As I came to know that delete and backspace key is not count under key press event, that the bug we found in our application.
Use case is something like when we change any value in text box using any numeric key and without saving record just closing directly then java script popup validation message comes but when we change any value in text box by using DELETE or BACK SPACE only then on the same scenario java scripted validation message was not coming and page directly get closed.
It was too frustrating that it's a minor thing for QA and how we missed that but as well said experience matters.
