Struct H3 

pub struct H3;

The <h3> element - level 3 heading.

Purpose

The <h3> element represents a third-level heading, used for subsections within <h2> sections. Part of the hierarchical heading structure.

Content Categories

• Flow Content
• Heading Content
• Palpable Content

Permitted Content Model

• Phrasing content

Common Use Cases

• Subsection headings within <h2> sections
• Detailed topic divisions
• Third-level document structure

Key Attributes

• Global attributes only

Example

<h2>Frontend Development</h2>
<h3>HTML</h3>
<p>HTML provides structure...</p>
<h3>CSS</h3>
<p>CSS handles styling...</p>
<h3>JavaScript</h3>
<p>JavaScript adds interactivity...</p>

Accessibility

• Maintains document outline hierarchy
• Should not skip heading levels
• Helps screen reader users navigate

WHATWG Specification

• 4.3.6 The h1-h6 elements

Trait Implementations

impl HtmlElement for H3

const TAG: &'static str = "h3"

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 CanContain<H3> for Hgroup

impl<T: PhrasingContent> CanContain<T> for H3

impl CanContain<Text> for H3

impl FlowContent for H3

impl HeadingContent for H3

impl PalpableContent for H3