Struct Sub 

pub struct Sub;

The <sub> element - subscript.

Purpose

The <sub> element represents subscript text, which appears half a character below the normal line and is often rendered in a smaller font. Used for mathematical, chemical, or typographical notations.

Content Categories

• Flow Content
• Phrasing Content
• Palpable Content

Permitted Content Model

• Phrasing content

Common Use Cases

• Chemical formulas (H₂O)
• Mathematical subscripts (xᵢ, aₙ)
• Footnote references
• Typographic conventions

Key Attributes

• Global attributes only

Example

<p>The chemical formula for water is H<sub>2</sub>O.</p>
<p>The variable x<sub>i</sub> represents the i-th element.</p>
<p>CO<sub>2</sub> emissions have increased.</p>

WHATWG Specification

• 4.5.20 The sub element

Trait Implementations

impl HtmlElement for Sub

const TAG: &'static str = "sub"

The HTML tag name (e.g., “div”, “span”, “img”).

const VOID: bool = false

Whether this is a void element (self-closing, no children allowed).

impl<T: PhrasingContent> CanContain<T> for Sub

impl CanContain<Text> for Sub

impl FlowContent for Sub

impl PalpableContent for Sub

impl PhrasingContent for Sub