unit-case
Specify lowercase or uppercase for units.
    a { width: 10px; }
/**              ↑
 *     These units */The fix
option can automatically fix most of the problems reported by this
rule.
Options
string: "lower"|"upper"
"lower"
The following patterns are considered violations:
a {
  width: 10PX;
}a {
  width: 10Px;
}a {
  width: 10pX;
}a {
  width: 10PIXEL;
}a {
  width: calc(10PX * 2);
}The following patterns are not considered violations:
a {
  width: 10px;
}a {
  width: calc(10px * 2);
}"upper"
The following patterns are considered violations:
a {
  width: 10px;
}a {
  width: 10Px;
}a {
  width: 10pX;
}a {
  width: 10pixel;
}a {
  width: calc(10px * 2);
}The following patterns are not considered violations:
a {
  width: 10PX;
}a {
  width: calc(10PX * 2);
}