What is a disadvantage of using non-HTML documents for accessibility?

Using non-HTML documents can present significant accessibility challenges because they might not have built-in accessibility features that are found in HTML. Many non-HTML formats, such as PDFs or Word documents, often do not support assistive technologies as effectively as HTML does. This means that users who rely on screen readers or other assistive tools may struggle to interpret and navigate the content properly. Additionally, non-HTML formats may not provide proper semantic structure, which is crucial for ensuring that screen readers can convey the information to users in a logical and comprehensible manner. This lack of accessibility features makes it difficult for individuals with disabilities to access content in non-HTML formats as easily as they can with well-structured HTML documents, which offer inherent advantages like semantic tagging, responsive design, and keyboard navigability.