Why are most marketing tags (Omniture, XE, etc.) written with document.write ()?

Question

Possible duplicate:
Why use document.write?

Given the negative effects of document.write (), why are most tracking / marketing tags written using document.write ()?

I thought about it quite a bit, and the only respectable idea that I came up with is that by writing it on the client side, we guarantee that the browser will not try to cache the resource. This is it? Any other ideas?

Answer 1

, , , - . " " , , , v3-, , .

[edit] "v3", Firefox 3, Netscape 3. Netscape , , 11.

Answer 2

, document.write, script, , . : http://www.stevesouders.com/blog/2009/04/27/loading-scripts-without-blocking/

Answer 3

, -, ...? , , - , , IMG- document.write -written IMG.

, , script . ( ) script (, URL-, ) , HTTPS. https-, https://omniture.com/xxx, http://omniture.com/yyy. javascript, HTML. , , , , " , ", , , , .

Answer 4

. script, , script. script document.getElementsByTagName("script") HTML script URI, , URI (http://example.com/blah.js#foo) DNS. , script, . document.write . (<script async>)