Subscript/Superscript

Description

Subscript and superscript formatting positions text below or above the normal baseline using the subsup mark in ADF. Commonly used for mathematical expressions, chemical formulas, footnotes, and ordinal numbers.

.md markdown syntax

Subscript Syntax

H<sub>2</sub>O
CO<sub>2</sub>

Superscript Syntax

E=mc<sup>2</sup>
10<sup>th</sup> anniversary

Combined with Metadata Comments

<!-- adf:text subsup="sub" -->
Chemical formula: H<sub>2</sub>SO<sub>4</sub>
<!-- adf:text subsup="sup" -->
Mathematical equation: x<sup>2</sup> + y<sup>2</sup>

.adf-schema.json schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "text"
    },
    "text": {
      "type": "string",
      "description": "Text content"
    },
    "marks": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "type": {
            "type": "string",
            "const": "subsup"
          },
          "attrs": {
            "type": "object",
            "properties": {
              "type": {
                "type": "string",
                "enum": ["sub", "sup"],
                "description": "Subscript (sub) or superscript (sup)"
              }
            },
            "required": ["type"],
            "additionalProperties": true
          }
        },
        "required": ["type", "attrs"]
      },
      "minItems": 1
    }
  },
  "required": ["type", "text", "marks"]
}

Examples

Chemical Formulas

Water: H<sub>2</sub>O
Carbon Dioxide: CO<sub>2</sub>
Sulfuric Acid: H<sub>2</sub>SO<sub>4</sub>
Methane: CH<sub>4</sub>

Mathematical Expressions

Pythagorean theorem: a<sup>2</sup> + b<sup>2</sup> = c<sup>2</sup>
Einstein's equation: E = mc<sup>2</sup>
Area of circle: A = πr<sup>2</sup>

Footnote References

This is important information<sup>1</sup>.
Research shows significant results<sup>2</sup>.
According to the study<sup>3</sup>.

Ordinal Numbers

1<sup>st</sup> place winner
21<sup>st</sup> century technology
3<sup>rd</sup> quarter results

Mathematical Powers

2<sup>3</sup> = 8
10<sup>6</sup> = 1,000,000
x<sup>n</sup> + y<sup>n</sup> = z<sup>n</sup>

Chemical Reactions

2H<sub>2</sub> + O<sub>2</sub> → 2H<sub>2</sub>O
C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> + 6O<sub>2</sub> → 6CO<sub>2</sub> + 6H<sub>2</sub>O

Units and Measurements

Area: 100 m<sup>2</sup>
Volume: 50 cm<sup>3</sup>
Speed: 3×10<sup>8</sup> m/s

Trademark and Copyright

Microsoft<sup>®</sup> Windows<sup>™</sup>
Copyright<sup>©</sup> 2023
All rights reserved<sup>®</sup>

Date Formats

January 1<sup>st</sup>, 2023
December 31<sup>st</sup>, 2022
March 3<sup>rd</sup>, 2024

Mathematical Subscripts

x<sub>1</sub>, x<sub>2</sub>, x<sub>3</sub>
a<sub>n</sub> = a<sub>1</sub> + (n-1)d
V<sub>max</sub> = 120 km/h

Scientific Notation

Avogadro's number: 6.022 × 10<sup>23</sup>
Planck constant: 6.626 × 10<sup>-34</sup>
Speed of light: 2.998 × 10<sup>8</sup> m/s

Isotopes

Carbon-14: <sup>14</sup>C
Uranium-235: <sup>235</sup>U
Hydrogen-2: <sup>2</sup>H (Deuterium)