Any combination of:

• Text, numbers, or special characters

• Emphasis Elements

  • <bold> Bold

  • <fixed-case> Fixed Case

  • <italic> Italic

  • <monospace> Monospace Text (Typewriter Text)

  • <num> ISO Numeric Emphasis

  • <overline> Overline

  • <roman> Roman

  • <ruby> Ruby Wrapper

  • <sans-serif> Sans Serif

  • <sc> Small Caps

  • <strike> Strike Through

  • <underline> Underline

• <alternatives> Alternatives For Processing

• Inline Display Elements

  • <inline-graphic> Inline Graphic

  • <private-char> Private Character (Custom or Unicode)

• <chem-struct> Chemical Structure (Display)

• <inline-formula> Formula, Inline

• Math Elements

  • <mml:math> Math (MathML Tag Set)

  • <tex-math> TeX Math Equation

• <named-content> Named Special (Subject) Content

• <styled-content> Styled Special (Subject) Content

• Baseline Change Elements

  • <sub> Subscript

  • <sup> Superscript