Enum Loading 

pub enum Loading {
    Eager,
    Lazy,
}

The loading attribute values for lazy-loading resources.

Purpose

Controls when the browser should load images and iframes, enabling performance optimization through lazy loading of off-screen content.

Usage Context

• Used with: <img>, <iframe> elements
• Performance: Lazy loading can significantly improve initial page load
• Default: Browser-dependent (typically eager)

Valid Values

• Eager: Load the resource immediately, regardless of viewport position
• Lazy: Defer loading until the resource is near the viewport

Example

use ironhtml_attributes::{AttributeValue, Loading};
let loading = Loading::Lazy;
assert_eq!(loading.to_attr_value(), "lazy");

<img src="above-fold.jpg" loading="eager" alt="Loads immediately">
<img src="below-fold.jpg" loading="lazy" alt="Loads when near viewport">
<iframe src="widget.html" loading="lazy"></iframe>

WHATWG Specification

• The loading attribute

Variants

Eager

Load the resource immediately, without deferring. Use for above-the-fold or critical content.

Lazy

Defer loading the resource until it is calculated to be near the viewport. Improves performance for below-the-fold content.

Trait Implementations

impl AttributeValue for Loading

fn to_attr_value(&self) -> Cow<'static, str>

Convert to the attribute value string.

impl Clone for Loading

fn clone(&self) -> Loading

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Loading

impl Debug for Loading

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Loading

impl PartialEq for Loading

fn eq(&self, other: &Loading) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Loading