WP_Customize_Manager::customize_preview_loading_style()

Source

public function customize_preview_loading_style() {
	?>
	<style>
		body.wp-customizer-unloading {
			opacity: 0.25;
			cursor: progress !important;
			-webkit-transition: opacity 0.5s;
			transition: opacity 0.5s;
		}
		body.wp-customizer-unloading * {
			pointer-events: none !important;
		}
		form.customize-unpreviewable,
		form.customize-unpreviewable input,
		form.customize-unpreviewable select,
		form.customize-unpreviewable button,
		a.customize-unpreviewable,
		area.customize-unpreviewable {
			cursor: not-allowed !important;
		}
	</style>
	<?php
}

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