Students must be able to perceive all content and interface information. 

• Alternative text is provided for images and non-text content throughout SI Lab Portal course materials. 
• Captions and transcripts are provided for multimedia assets and videos embedded in SI Lab Portal content. Embedded video players support platform-level captioning tools. 
• Color and contrast have been carefully considered in SI Lab Portal’s design. Science Interactive has implemented custom CSS enhancements to ensure color contrast ratios meet or exceed WCAG 2.2 AA requirements. Color is never used as the sole means of conveying information. 
• Text resizing is supported without loss of content or functionality, and text spacing adjustments are maintained throughout the platform. 
• Content reflow is supported so that SI Lab Portal content is usable at varying viewport sizes and zoom levels. 

Students must be able to interact with and navigate all content. 

• Keyboard navigation is supported throughout SI Lab Portal’s student portal. Pages are well-structured with logical focus order, skip navigation links, and descriptive headings to support screen reader and keyboard-only navigation. 
• Descriptive link text is used throughout SI Lab Portal content in place of raw URLs, so the purpose of each link is clear from context. 
• Timing is managed to support all learners. Assignment time limits can be extended by instructors in advance, and session timeouts provide advance notice with the option to extend. 
• Seizure safety — SI Lab Portal content does not include elements known to trigger photosensitive seizures. No interface elements flash above the WCAG threshold. 
• Navigation is consistent and predictable across the platform. Navigational elements appear in the same location across pages, and students can access content through a clear course homepage structure. 
• No motion-actuated components are present in the student interface. Students are not required to perform device motion gestures to interact with content. 

Content and navigation must be clear and consistent. 

• Readable text is designed with appropriate contrast, visual hierarchy, spacing, and organization to support ease of reading and comprehension. 
• Predictable behavior — the platform behaves consistently across pages. Context does not change unexpectedly on focus or input. 
• Error identification and guidance — when errors occur, they are clearly identified and described. Where possible, correction suggestions are provided to help students resolve issues. 
• Help and support are available consistently throughout the platform. Contact information is provided so that students with disabilities can quickly reach SI support for assistance. 
• Self-paced content — SI Lab Portal is designed as a self-paced learning environment, giving students sufficient time to read, navigate, and interact with course material. 

Content must be compatible with current and future assistive technologies. 

• Modern web standards — SI Lab Portal is built using standards-compliant web development practices to maximize compatibility with assistive technologies including screen readers, voice input software, and other tools. 
• Mathematical content is rendered using MathJax, which supports MathJax-compatible screen readers, enabling students to access equations and formulas through assistive technology. 
• Programmatic structure — interface elements use standard HTML and ARIA conventions, ensuring names, roles, and values are accessible to assistive technology where supported by the platform. 
• Status messages and feedback are provided throughout the student experience, including assignment submission confirmations and error states.