+<p class="note">
+ Internally, your operating system may identify the mouse buttons as
+ <kbd class="mouse">Button1</kbd>, <kbd class="mouse">Button2</kbd>, and
+ <kbd class="mouse">Button3</kbd>, respectively. It may be possible to
+ invert the order of buttons to accommodate left-handed users, or to re-assign
+ them arbitrarily. This manual assumes the canonical order.
+</p>