WP_Customize_Manager::customize_preview_loading_style()

	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
	}