values = "
/* Keyword value */
letter-spacing: normal;
/* <length> values */
letter-spacing: 0.3em;
letter-spacing: 3.0px;
letter-spacing: .3px;
/* Global values */
letter-spacing: inherit;
letter-spacing: initial;
letter-spacing: unset;
";
all = Sort@StringCases;
"[\"" <> StringRiffle <> "\"].contains(&mode)" // CopyToClipboard