The following pages provide various techniques for improving the accessibility of web forms:
接下来的网页会为 web 表单技术的人提供一系列的知识：
- Basic form hints: Adding hints and descriptions for invalid or required fields
- Alerts: Using alerts to provide client-side validation error messages
- Multi-part labels: Enabling complex form labels with a control inside each label
See also the Yahoo! article on form validation and ARIA, covering much of the same content.