Summary:网站上的数据输入表单字段是至关重要的ecommerce and many other applications. Fields need labels and (sometimes) instructions, but placing this text inside the field lowers usability and accessibility and should be avoided.
Placeholder text within a form field makes it difficult for people to remember what information belongs in a field, and to check for and fix errors. It also poses additional burdens for users with visual and cognitive impairments.
Katie Sherwinis a Senior User Experience Specialist with Nielsen Norman Group. She specializes in helping organizations utilize principles of user-centered design and strategic communication to achieve their goals.