public static function get_selectors_primary_color_background() {

		/**
		 * Filter the list of CSS selectors for elements where the primary color is used as the background
		 *
		 * @since 4.10.0
		 *
		 * @param string[] $selectors A list of CSS selectors.
		 */
		return apply_filters(
			'llms_theme_support_get_selectors_primary_color_background',
			array(

				// Buttons.
				'.llms-button-primary',
				'.llms-button-primary:hover',
				'.llms-button-primary.clicked',
				'.llms-button-primary:focus',
				'.llms-button-primary:active',
				'.llms-button-action',
				'.llms-button-action:hover',
				'.llms-button-action.clicked',
				'.llms-button-action:focus',
				'.llms-button-action:active',

				// Pricing Tables.
				'.llms-access-plan-title',
				'.llms-access-plan .stamp',
				'.llms-access-plan.featured .llms-access-plan-featured',

				// Checkout.
				'.llms-checkout-wrapper .llms-form-heading',

				// Notices.
				'.llms-notice:not(.llms-debug)',

				// Progress Bar.
				'.llms-progress .progress-bar-complete',

				// My Grades.
				'.llms-sd-widgets .llms-sd-widget .llms-sd-widget-title',

				// Instructor.
				'.llms-instructor-info .llms-instructors .llms-author .avatar',

				// Quizzes.
				'.llms-question-wrapper ol.llms-question-choices li.llms-choice input:checked + .llms-marker',

			)
		);

	}