Trusted Tester 1D: Non-interference states what about non-conforming content in relation to accessible content?

• A. Non-conforming content does not interfere or block access to accessible content.
• B. Non-conforming content should obstruct access to accessible content.
• C. Non-conforming content must be hidden from assistive technologies.
• D. Non-conforming content must be placed in a separate frame.

Answer: (C)

Non-interference is about making sure content that doesn’t meet accessibility requirements cannot disrupt how users access content that does meet them. In this criterion, the way to achieve that is to ensure non-conforming content is hidden from assistive technologies, so screen readers and other AT only encounter the accessible content. If AT could access non-conforming pieces, it might announce or interact with them in a way that blocks or confuses navigation of the accessible content. So hiding non-conforming content from assistive technologies preserves a smooth, uninterrupted experience for users relying on these tools. The idea is not to obstruct all content for sighted users, but to prevent AT from processing content that could interfere with accessibility.