use for potentially dangerous situations involving data loss, malfunction,
or sound quality issues. Currently rendered in a red box.
+.mac, .lin, .win:
+use as additional classes to mark a section as relevant for these operating
+systems only.
+
Check _manual/01_welcome-to-ardour/02_about-ardour-documentation.html, it
serves as a style and markup guide.
See above for other <kbd> classes to denote menu items, selections, mouse
events and controller actions.
+Keys and mouse key names should always be capitalized. We do not need to
+distringuish between "x" and "X", because the latter would be "Shift-X".
+In case you forget, the stylesheet takes care of this.
<code>
is only used for program code, or the content of configuration files etc. Do
not abuse to style keys or user input, use <kbd> instead.