use_default_gallery_style filter-hook . WP 3.1.0

Filters whether to print default gallery styles.

Usage

add_filter( 'use_default_gallery_style', 'filter_function_name_5715' );
function filter_function_name_5715( $print ){
	// filter...

	return $print;
}

$print(true/false)

Whether to print default gallery styles. Otherwise, defaults to true.
Default: false if the theme supports HTML5 galleries

Where the hook is called

if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {

Where the hook is used (in WP core)