Aside
| Description | Represents content that is tangentially related to the main content, such as side notes or additional commentary. |
|---|---|
| Namespace | 2.0 |
| Category | grouping |
Attributes
Specifies how the element is placed relative to surrounding content (e.g., block-level or inline flow).
Defines the direction of text flow (e.g., left-to-right, right-to-left, or vertical).
Sets the background color for the element’s content area.
Specifies the color of the border around the element.
Indicates the style of the border (e.g., solid, dashed, dotted).
Defines the thickness of the border line in user space units (such as points).
Determines the space between the element’s border (or boundary) and its inner content.
Applies the primary color (fill or stroke) for the text or graphic content.
Specifies the number of columns for multi-column layouts.
Indicates the spacing (gap) between columns in multi-column layouts.
Specifies the width of each column in multi-column layouts.
Main indicator of type. This semantic association allows tools to present and support interaction with the object in a manner that is consistent with user expectations about other objects of that type.
Differences
Well tagged PDF:
The 'Aside' element in Well-Tagged PDF denotes content that is related but secondary to the main content. It is used to present supplementary information, such as side notes or tangential details.
For Well-Tagged PDF, the 'Aside' element should be clearly marked and appropriately nested within the structure tree. Its use should enhance the document’s reusability by clearly separating supplementary content from the primary narrative.
PDFUA:
In PDF/UA, the 'Aside' element is intended for content that supports but is not essential to the main text. It aids in accessibility by allowing users to bypass non-critical information if needed.
PDF/UA mandates that the 'Aside' element is tagged with clear semantics, often including a title or description, to ensure that assistive technologies can correctly interpret its purpose as supplementary information.
Use cases
Aside example showing a content outside of main flow
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