Achieving Full Accessibility Compliance in Modern Web Applications

Creating accessible web applications ensures that all users, including those with disabilities, can access your site. How can developers ensure their web apps are fully compliant with accessibility standards like WCAG 2.1? Discuss best practices for keyboard navigation, screen reader support, and providing meaningful alt text for images. How do you handle complex components like modals, dynamic forms, and interactive content while ensuring they are usable for users with assistive technologies? Additionally, what tools or techniques can developers use to audit and continuously improve the accessibility of their applications?