At a glance
Reading order should preserve the author’s meaningful sequence, not merely sort visible text from top to bottom. For a two-column article, this often means finishing the left column before the right, with notes and sidebars inserted where they make sense. Compare the source, tag structure and actual assistive-technology reading.
The correct position of the sidebar depends on the authored meaning, not just its coordinates.
| Sequence | Element | Review question |
|---|---|---|
| 1 | Title and introduction | Does the context arrive first? |
| 2 | Left-column body | Are paragraphs continuous? |
| 3 | Right-column continuation | Does the sentence transition correctly? |
| 4 | Relevant note or sidebar | Is its relationship clear? |
| 5 | Following section | Does navigation remain logical? |
Scroll sideways to see all columns. Use arrow keys when the table is focused.
Write the intended sequence first
Sketch the meaningful blocks in order: title, introduction, column content, related figure, note and following section. Ask the author about ambiguous sidebars or references. A visual coordinate heuristic cannot decide every semantic relationship.
Include page transitions. A sentence can begin at the bottom of one column and continue on another page, while a repeating footer should not interrupt it. For forms, include labels, instructions and interactive controls in the sequence.
- Identify the meaningful blocks and their intended order.
- Separate repeated decoration from actual content.
- Compare tags and content with the intended sequence.
- Read the exact output with assistive technology.
Inspect tags and actual reading
W3C’s PDF reading-order technique explains the importance of tag order and the order of content within tags. A tag viewer helps locate structure, but the existence of a tree does not prove correct meaning. Review every confusing boundary against the source.
Listen or navigate through the document in a declared test environment. Watch for a line from column two appearing halfway through a paragraph from column one, notes read without a reference, decorative footers or controls announced after their instructions have been lost.
- Column transition: does one passage finish before the next starts?
- Footnote: can the reader connect it to the relevant statement?
- Sidebar: is it introduced as related or separate content?
- Form: do focus order and instructions support the task?
Correct the source where possible
An authoring template with real headings and intentional text flow is easier to maintain than repeated repairs to exported coordinates. If the PDF is the only available source, use a qualified structure-editing or conversion workflow and check the exact delivered version.
Record the before/after sequence and any remaining uncertainty. A rebuilt PDF or HTML alternative may intentionally reorganize the visual layout; an original-layout path has different preservation checks. Choose the path based on the reader’s needs and the required deliverables.
Sources and scope
Methods, worksheets and illustrative examples are DocAccessible editorial contributions. These references support the technical or product details described above. W3C techniques are informative guidance; they are not a certification scheme.
- W3C PDF3: reading and tab order
The relationship between PDF tag order, reading sequence and interactive elements.
- W3C PDF4: decorative artifacts
Keeping decorative content out of the meaningful reading sequence.
- DocAccessible remediation options
The different output paths and their review requirements.
Written by the DocAccessible team under our editorial policy. Suggest a correction if a source or product detail needs updating.