RT

Description	Specifies the ruby text element that provides supplementary pronunciation or annotation information for the associated base text.
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.

RubyAlign

Controls how ruby text (primarily in East Asian typography) is aligned relative to its base text.

RubyPosition

Specifies the placement of ruby text (above or below the base text).

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.

Properties

ActualText

Properties

Gives an exact text equivalent for non-textual or symbolic content, allowing screen readers to read it as plain text.

Differences

Well tagged PDF:

The 'RT' (Ruby Text) element in Well-Tagged PDF contains the annotation text that provides phonetic or supplementary information related to the base text.

It should be properly nested within a Ruby element and clearly linked to its corresponding RB element to support accurate reflow and extraction.

PDFUA:

In PDF/UA, the 'RT' element delivers essential supplementary information for ruby annotations, enhancing the accessibility of the content by clarifying pronunciation or meaning.

The 'RT' element must be clearly associated with its corresponding 'RB' element and include alternative text where necessary to support assistive technologies.