is-document.all 
Is this value document.all, i.e. an object with the IsHTMLDDA internal slot?
Example
var isDocumentAll = require('is-document.all');
var assert = require('assert');
assert(!isDocumentAll(undefined));
assert(!isDocumentAll(null));
assert(!isDocumentAll({}));
assert(!isDocumentAll(function () {}));
// in a browser:
assert(isDocumentAll(document.all));
Tests
Simply clone the repo, npm install, and run npm test
