Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Tag Tree(also: PDF Tag Structure, Structure Tree, Tagged PDF Structure)
- The hierarchical structure of semantic tags embedded within a PDF document that defines the logical organization and reading order of its content. A tag tree is analogous to the DOM (Document Object Model) in HTML — it identifies headings, paragraphs, lists, tables, figures, and…
- Tagged PDF(also: Structured PDF, Accessible PDF)
- A PDF document that contains semantic structure tags defining the logical reading order, headings, paragraphs, lists, tables, and figures — enabling screen readers and other assistive technologies to navigate and interpret the content meaningfully. Without tags, a PDF is…
- Testability(also: Reliably Human Testable, Machine Testable)
- In the context of accessibility standards, testability refers to the degree to which a guideline or success criterion can be evaluated with consistent, reproducible results — either through automated tools (machine testable) or through human inspection where at least 80% of…
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