Signal error after loss of focus
Once users move away from the input field by selecting another element or removing the cursor, the system can begin validating the input. In case an error occurs, display a message next to the input and explain how users can correct it. Make sure the message is clear and polite and provides straightforward instructions using plain language.
Pro Tip: From an accessibility viewpoint, it's important to accompany the error message with an icon indicating an error.
