Segmented

A row of links on a pill track with the selected one raised. An email cannot switch views, so each option links to the page for that view.

Basic

Each option is a link, and value picks the one drawn as selected, so the email shows which view it was sent for.

Size

Set size to small or large to change the height and font size.

Block

Set block to fill the width, with options of equal width.

Icons

Pass an icon to an option to draw it before the label.