H4

ironhtml_elements

Struct H4 

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pub struct H4;
Expand description

The <h4> element - level 4 heading.

§Purpose

The <h4> element represents a fourth-level heading, used for subsections within <h3> sections. Part of the hierarchical heading structure.

§Content Categories

  • Flow Content
  • Heading Content
  • Palpable Content

§Permitted Content Model

  • Phrasing content

§Common Use Cases

  • Sub-subsection headings
  • Detailed breakdowns within <h3> sections
  • Fine-grained document structure

§Key Attributes

  • Global attributes only

§Example

<h3>JavaScript Basics</h3>
<h4>Variables</h4>
<p>Variables store data...</p>
<h4>Functions</h4>
<p>Functions are reusable blocks...</p>

§Accessibility

  • Part of document outline
  • Helps organize complex content
  • Screen readers use for navigation

§WHATWG Specification

Trait Implementations§

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impl HtmlElement for H4

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const TAG: &'static str = "h4"

The HTML tag name (e.g., “div”, “span”, “img”).
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const VOID: bool = false

Whether this is a void element (self-closing, no children allowed).
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impl CanContain<H4> for Hgroup

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impl<T: PhrasingContent> CanContain<T> for H4

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impl CanContain<Text> for H4

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impl FlowContent for H4

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impl HeadingContent for H4

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impl PalpableContent for H4

Auto Trait Implementations§

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impl Freeze for H4

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impl RefUnwindSafe for H4

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impl Send for H4

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impl Sync for H4

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impl Unpin for H4

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impl UnwindSafe for H4

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.