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Adobe Acrobat SDK
Adobe® Supplement to the ISO 32000
Interaction between accessibility preference and annotation tab order
This note clarifies the viewer-specific behavior of different Acrobat versions relative to annotation tab
order and the accessibility preference selection.
Beginning in PDF 1.5, the user experience of tabbing between annotations on a page (tab order) can be
made explicit by means of the page object
defined, Acrobat tab order varies depending on the Acrobat version and on accessibility preference
settings. This behavior is viewer-specific because it is not specified by the PDF specification. Because the
row, column, and structured tab order settings behave exactly as specified in the PDF specification, they
do not have a viewer-specific behavior.
The Acrobat Preferences dialog box presents an Accessibility window. The Tab Order panel in that window
has a check box titled "Use document structure for tab order when no explicit tab order is specified. "
Selecting that check box specifies accessibility preferences.
Regardless of the Acrobat accessibility preference setting, the following applies to (a) all Acrobat versions
when processing a PDF document that omits a
PDF document regardless of a
If the document is structured (contains tagging), the annotations are visited in structure order.
●
Otherwise, widgets are visited in the order in which they appear in the
●
annotation types are visited in row order.
Note:
Documents that conform to PDF version 1.5 or earlier have no
Accessibility preference selected (default setting)
The following bulleted items describe how the accessibility preference influences annotation tab order
when the accessibility preference is selected:
If the document is viewed with Acrobat 6 or later and is structured, the
●
follows:
Widget order: When
Annots
support Widget order.
All other tab orders: Annotations are visited as specified in the PDF specification supported by the
particular version of Acrobat. Acrobat 6 and later support increasingly specific levels of tab order.
If the document omits a
●
presence of structure (tagging) affects tab order as follows:
Structured: Annotations are visited in structure order.
Not structured: Widgets are visited in the order in which they appear in the
then other annotation types are visited in row order.
Note:
Documents that conform to PDF version 1.5 or earlier have no
Accessibility preference not selected
The following bulleted items explains Acrobat behavior relative to annotation tab order when the
accessibility preference is not selected.
entry:
Tabs
is set to
Tabs
array and then other annotation types are visited in structure order. Acrobat 9 and later
entry or when the document is viewed with Acrobat 5 or earlier, the
Tabs
Implementation Notes to the PDF Reference, sixth edition
entry (see Table 3.27). However, when this entry is not
Tabs
entry or (b) Acrobat 5 or earlier when processing a
Tabs
, widgets are visited in the order in which they appear in the
W
Implementation Notes
array, and then other
Annots
entries.
Tabs
entry affects tab order as
Tabs
array, and
Annots
entries.
Tabs
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