This method has been deprecated. Customizer no longer supports IE8, so all supported browsers recognize HTML5 instead.

WP_Customize_Manager::customize_preview_html5()

Prints a workaround to handle HTML5 tags in IE < 9.

Source

File: wp-includes/class-wp-customize-manager.php 

	public function customize_preview_html5() {
		_deprecated_function( __FUNCTION__, 'WP-4.7.0' );
	}

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Changelog

Changelog
Version Description
4.7.0 Customizer no longer supports IE8, so all supported browsers recognize HTML5.
3.4.0 Introduced. This method has been deprecated. Customizer no longer supports IE8, so all supported browsers recognize HTML5 instead.