wp_customize_support_script() │ WP 3.4.0

Prints a script to check whether or not the Customizer is supported, and apply either the no-customize-support or customize-support class to the body.

This function MUST be called inside the body tag.

Ideally, call this function immediately after the body tag is opened. This prevents a flash of unstyled content.

It is also recommended that you add the "no-customize-support" class to the body tag by default.

Хуков нет.

Возвращает

null. Ничего (null).

Использование

wp_customize_support_script();

Список изменений

С версии 3.4.0 Введена.
С версии 4.7.0 Support for IE8 and below is explicitly removed via conditional comments.
С версии 5.5.0 IE8 and older are no longer supported.

Код wp_customize_support_script() WP 7.0.1

wp-includes/theme.php 
<?php
function wp_customize_support_script() {
	$admin_origin = parse_url( admin_url() );
	$home_origin  = parse_url( home_url() );
	$cross_domain = ( strtolower( $admin_origin['host'] ) !== strtolower( $home_origin['host'] ) );
	ob_start();
	?>
	<script>
		(function() {
			var request, b = document.body, c = 'className', cs = 'customize-support', rcs = new RegExp('(^|\\s+)(no-)?'+cs+'(\\s+|$)');

	<?php	if ( $cross_domain ) : ?>
			request = (function(){ var xhr = new XMLHttpRequest(); return ('withCredentials' in xhr); })();
	<?php	else : ?>
			request = true;
	<?php	endif; ?>

			b[c] = b[c].replace( rcs, ' ' );
			// The customizer requires postMessage and CORS (if the site is cross domain).
			b[c] += ( window.postMessage && request ? ' ' : ' no-' ) + cs;
		}());
	</script>
	<?php
	wp_print_inline_script_tag( wp_remove_surrounding_empty_script_tags( ob_get_clean() ) . "\n//# sourceURL=" . rawurlencode( __FUNCTION__ ) );
}