Lbl

Description	Represents a label within a list item, used to denote or number the item, such as a bullet or numeric identifier.
Namespace	1.7 2.0
Category	inline

Attributes

Placement

Specifies how the element is placed relative to surrounding content (e.g., block-level or inline flow).

WritingMode

Defines the direction of text flow (e.g., left-to-right, right-to-left, or vertical).

BackgroundColor

Sets the background color for the element’s content area.

BorderColor

Specifies the color of the border around the element.

BorderStyle

Indicates the style of the border (e.g., solid, dashed, dotted).

BorderThickness

Defines the thickness of the border line in user space units (such as points).

Padding

Determines the space between the element’s border (or boundary) and its inner content.

Color

Applies the primary color (fill or stroke) for the text or graphic content.

role

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 'Lbl' element in Well-Tagged PDF is used to define label text that typically serves as a descriptor for form controls or other interactive elements.

It should be clearly associated with the element it labels and correctly nested in the structure tree to maintain logical relationships for content extraction and reflow.

PDFUA:

In PDF/UA, 'Lbl' is essential for providing accessible labels that help users identify and understand the purpose of associated interactive elements.

Labels must be explicitly tagged with 'Lbl' and include alternative text or descriptions if needed, ensuring assistive technologies can convey the correct meaning to the user.