What is critical to include during the design phase of accessibility?

Integrating testing tools during the design phase of accessibility is crucial because these tools help identify potential barriers and issues that could hinder user experience for people with disabilities. By utilizing testing tools early in the design process, designers can assess the accessibility of their content or product against current standards and guidelines, such as the Web Content Accessibility Guidelines (WCAG). This proactive approach allows for adjustments to be made before the final implementation, ensuring that the design is inclusive and functional for all users.

Gathering feedback from users is indeed important but typically comes after initial designs are created, during usability testing. Ensuring designs are marketable may not directly relate to accessibility, focusing rather on aesthetics and target audience appeal. Creating a timeline for development is a project management consideration but does not specifically address the accessibility features themselves. Hence, prioritizing the integration of testing tools establishes a foundation for accessible design.