wp_sizes_attribute_includes_valid_auto( string $sizes_attr ): bool

Checks whether the given ‘sizes’ attribute includes the ‘auto’ keyword as the first item in the list.

Description

Per the HTML spec, if present it must be the first entry.

Parameters

$sizes_attrstringrequired: The 'sizes' attribute value.

Return

bool True if the 'auto' keyword is present, false otherwise.

Source

function wp_sizes_attribute_includes_valid_auto( string $sizes_attr ): bool {
	list( $first_size ) = explode( ',', $sizes_attr, 2 );
	return 'auto' === strtolower( trim( $first_size, " \t\f\r\n" ) );
}

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Used by	Description
wp_img_tag_add_auto_sizes()`wp-includes/media.php`	Adds ‘auto’ to the sizes attribute to the image, if the image is lazy loaded and does not already include it.
wp_get_attachment_image()`wp-includes/media.php`	Gets an HTML img element representing an image attachment.

Changelog

Version	Description
6.7.0	Introduced.

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