There is no difference.
IE6 was known for some notorious performance issues related to its non-generational garbage collector when operating on large object trees. It incorporates a suite of technologies aimed at improving user experience with web pages.
Why they decided that, but 0, "" and false aren't equal, I don't know. write() will just be a line of text and writeln() will be a line of text that puts the next writeln() on another line.
There is, as you say a difference. But in practice, most use of ultimedescente.com() or writeln() (in my experience) is to produce blocks of text rather than fully formed html, and in that context they probably won't see any difference.
Definition and Usage.
The writeln() method is identical to the ultimedescente.com() method, with the addition of writing a newline character after each statement.Download