wp_dashboard_browser_nag()

function wp_dashboard_browser_nag() {
	$notice = '';
	$response = wp_check_browser_version();

	if ( $response ) {
		if ( $response['insecure'] ) {
			/* translators: %s: browser name and link */
			$msg = sprintf( __( "It looks like you're using an insecure version of %s. Using an outdated browser makes your computer unsafe. For the best ClassicPress experience, please update your browser." ),
				sprintf( '<a href="%s">%s</a>', esc_url( $response['update_url'] ), esc_html( $response['name'] ) )
			);
		} else {
			/* translators: %s: browser name and link */
			$msg = sprintf( __( "It looks like you're using an old version of %s. For the best ClassicPress experience, please update your browser." ),
				sprintf( '<a href="%s">%s</a>', esc_url( $response['update_url'] ), esc_html( $response['name'] ) )
			);
		}

		$browser_nag_class = '';
		if ( !empty( $response['img_src'] ) ) {
			$img_src = ( is_ssl() && ! empty( $response['img_src_ssl'] ) )? $response['img_src_ssl'] : $response['img_src'];

			$notice .= '<div class="alignright browser-icon"><a href="' . esc_attr($response['update_url']) . '"><img src="' . esc_attr( $img_src ) . '" alt="" /></a></div>';
			$browser_nag_class = ' has-browser-icon';
		}
		$notice .= "<p class='browser-update-nag{$browser_nag_class}'>{$msg}</p>";

		$browsehappy = 'https://browsehappy.com/';
		$locale = get_user_locale();
		if ( 'en_US' !== $locale )
			$browsehappy = add_query_arg( 'locale', $locale, $browsehappy );

		$notice .= '<p>' . sprintf( __( '<a href="%1$s" class="update-browser-link">Update %2$s</a> or learn how to <a href="%3$s" class="browse-happy-link">browse happy</a>' ), esc_attr( $response['update_url'] ), esc_html( $response['name'] ), esc_url( $browsehappy ) ) . '</p>';
		$notice .= '<p class="hide-if-no-js"><a href="" class="dismiss" aria-label="' . esc_attr__( 'Dismiss the browser warning panel' ) . '">' . __( 'Dismiss' ) . '</a></p>';
		$notice .= '<div class="clear"></div>';
	}

	/**
	* Filters the notice output for the 'Browse Happy' nag meta box.
	*
	* @since WP-3.2.0
	*
	* @param string $notice   The notice content.
	* @param array  $response An array containing web browser information.
	*/
	echo apply_filters( 'browse-happy-notice', $notice, $response );
}