A single class name entry. null, undefined, and booleans are skipped; strings and numbers are used as is (0 is a value, and an empty string adds no class). Entries are split on whitespace.
null
undefined
0
A single class name entry.
null,undefined, and booleans are skipped; strings and numbers are used as is (0is a value, and an empty string adds no class). Entries are split on whitespace.