Comments on: Obscure Internet Explorer Bugs: #1 of… who knows? http://www.nickfitz.co.uk/2005/05/17/obscure-internet-explorer-bugs-1-of-who-knows/ The occasional online observations of Nick Fitzsimons Thu, 15 Jul 2010 10:27:23 +0000 hourly 1 http://wordpress.org/?v=3.0 By: zcorpan http://www.nickfitz.co.uk/2005/05/17/obscure-internet-explorer-bugs-1-of-who-knows/comment-page-1/#comment-5 zcorpan Wed, 08 Jun 2005 19:07:27 +0000 http://www.nickfitz.co.uk/?p=2#comment-5 Yep, any unknown tag is treated as an empty element by IE. I tried this: <!DOCTYPE HTML><HTML><HEAD><TITLE></TITLE></HEAD><BODY><P><FOO></FOO></P></BODY></HTML> ...and then: javascript:(function(){ var elms = document.getElementsByTagName("*"), i = elms.length; while(i--){ alert(elms[i].tagName); }})() It also seems to treat the DOCTYPE as an element, with a tagName of "!". :) Yep, any unknown tag is treated as an empty element by IE. I tried this:

<!DOCTYPE HTML><HTML><HEAD><TITLE></TITLE></HEAD><BODY><P><FOO></FOO></P></BODY></HTML>

…and then:

javascript:(function(){ var elms = document.getElementsByTagName(“*”), i = elms.length; while(i–){ alert(elms[i].tagName); }})()

It also seems to treat the DOCTYPE as an element, with a tagName of “!”. :)

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