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Determines whether to add the loading attribute to the specified tag in the specified context.

Parameters

$tag_namestringrequired: The tag name.
$contextstringrequired: Additional context, like the current filter name or the function name from where this was called.

Return

bool Whether to add the attribute.

Source

	// Check if there is already a 'sizes' attribute.
	$sizes = strpos( $image, ' sizes=' );

	if ( ! $sizes ) {
		$sizes = wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );
	}
}

if ( $srcset && $sizes ) {
	// Format the 'srcset' and 'sizes' string and escape attributes.
	$attr = sprintf( ' srcset="%s"', esc_attr( $srcset ) );

	if ( is_string( $sizes ) ) {
		$attr .= sprintf( ' sizes="%s"', esc_attr( $sizes ) );
	}

	// Add the srcset and sizes attributes to the image markup.
	return preg_replace( '/<img ([^>]+?)[\/ ]*>/', '<img $1' . $attr . ' />', $image );
}

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Changelog

Version	Description
5.7.0	Now returns `true` by default for `iframe` tags.
5.5.0	Introduced.

User Contributed Notes

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shaunjeffrey 5 years ago

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wp_lazy_loading_enabled returns true for all tags, which is every time this function is called by default. Hooking into the wp_lazy_loading_enabled filter is the primary way of enabling or disabling this feature, however it does not readily allow this to be enabled or disabled for specific attachments or mime-types.
```
add_filter( 'wp_lazy_loading_enabled', '__return_false' );
```
1. To change how this feature works for specific attachments, the ‘loading’ attribute can be supplied to the wp_get_attachment_image function, or you can modify or remove the attribute using the wp_get_attachment_image_attributes filter.
```
$attr['loading'] = false;
return wp_get_attachment_image( $attachment_id, $size, $icon, $attr );
```
Or
```
add_filter( 'wp_get_attachment_image_attributes', function( $attr, $attachment, $size ) {
	if ( $attachment->post_mime_type === 'image/svg+xml' ) {
		unset( $attr['loading'] );
	}
	return $attr;
} );
```
2. To change how this works for specific avatars, you can either redefine the get_avatar function, supply the ‘loading’ attribute within the ‘extra_attr’ argument, or replace the HTML using the get_avatar filter.

3. the_content, the_excerpt and widget_text_filters will call the wp_filter_content_tags filter on the content, which will also add the ‘loading’ attribute to image tags. To adjust this, the wp_img_tag_add_loading_attr filter can be used to manage the ‘loading’ attribute on a tag by tag basis.
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wp_lazy_loading_enabled( string $tag_name, string $context ): bool

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Parameters

Return

Source

Changelog

User Contributed Notes