Questions about the JavaScript Authoritative Guide Sixth Edition

[imlijq]

Hello, I saw in the introduction to the 75th page of the JavaScript Authoritative Guide(Rhino book): About strict equality operators, if both values are null or both are undefined, they are not equal, but I am in Chrome ( The result in the version is 75.0.3770.100) is like this, because i can't find your mailbox, so ask a question here, sorry, bothering

null===null // true
undefined===undefined // true