`dnsDomainLevels()`

Number of dots in the host name ("www.corp.example" gives 2).

dnsDomainLevels(host)  →  number

Counts dots, so it also counts them in IP literals: dnsDomainLevels("10.1.2.3") is 3.

Example

if (dnsDomainLevels(host) == 0) {
  return "DIRECT";
}

Derived from each engine's vendored helper library plus its native bindings (see engines).
Function	chromium <=51	chromium >=52	firefox all	pacparser <=1.4.6	pacparser 1.5.0	pacparser >=1.5.1	reference all
`dnsDomainLevels`	yes	yes	yes	yes	yes	yes	yes