WP_Widget_Custom_HTML::add_help_text() WordPress Method

	public static function add_help_text() {
		$screen = get_current_screen();

		$content  = '<p>';
		$content .= __( 'Use the Custom HTML widget to add arbitrary HTML code to your widget areas.' );
		$content .= '</p>';

		if ( 'false' !== wp_get_current_user()->syntax_highlighting ) {
			$content .= '<p>';
			$content .= sprintf(
				/* translators: 1: Link to user profile, 2: Additional link attributes, 3: Accessibility text. */
				__( 'The edit field automatically highlights code syntax. You can disable this in your <a href="%1$s" %2$s>user profile%3$s</a> to work in plain text mode.' ),
				esc_url( get_edit_profile_url() ),
				'class="external-link" target="_blank"',
				sprintf(
					'<span class="screen-reader-text"> %s</span>',
					/* translators: Accessibility text. */
					__( '(opens in a new tab)' )
				)
			);
			$content .= '</p>';

			$content .= '<p id="editor-keyboard-trap-help-1">' . __( 'When using a keyboard to navigate:' ) . '</p>';
			$content .= '<ul>';
			$content .= '<li id="editor-keyboard-trap-help-2">' . __( 'In the editing area, the Tab key enters a tab character.' ) . '</li>';
			$content .= '<li id="editor-keyboard-trap-help-3">' . __( 'To move away from this area, press the Esc key followed by the Tab key.' ) . '</li>';
			$content .= '<li id="editor-keyboard-trap-help-4">' . __( 'Screen reader users: when in forms mode, you may need to press the Esc key twice.' ) . '</li>';
			$content .= '</ul>';
		}

		$screen->add_help_tab(
			array(
				'id'      => 'custom_html_widget',
				'title'   => __( 'Custom HTML Widget' ),
				'content' => $content,
			)
		);
	}