javascript - IE8 iframe renders simple text file as HTML , I need raw code -

i have iframes need show codefiles. codefiles have .txt extention , should show code text. works on browsers except ie8. ie8 keeps rendering code files html.

    <iframe id="codefile222"      width="100%" height="200px"     marginheight="0" frameborder="0"      src="http://mrsbos.wikispaces.com/file/view/guessnumber.txt"     name="codefile222"      onload="autoresize('codefile222');changecolor('codefile222')"     > 

any idea this, make work in ie8

the content-type http header indicates mime type of resource (a web page, image, or download). html pages, mime type text/html, , text files, text/plain.

the server send text/plain;charset=utf-8 text files (as, example, shown in firebug's net panel when performing hard reload of file using ctrl+f5). however, internet explorer, unlike other web browsers, see html in file , second-guess server (microsoft documentation).

because can have security implications, yet microsoft didn't want risk breaking backward compatibility older sites (by making ie's behavior consistent of other browsers), internet explorer 8 , newer support x-content-type-options: nosniff header disable html detection in case. however, on such site wikispaces, might not have option send header, , in case, header have no effect in internet explorer 6 , 7.

on wikispaces, makes sense use provided source-code formatting feature (see wikitext page):

[[code format="javascript"]] alert('hello, world'); [[code]] 

and if want store code on separate page, can include page people supposed read (wikispaces include page). called transclusion:

[[include page="pagename"]] 

failing that, option may html-escape code (using few text replacements) , insert between <pre></pre>. uploading html file (file extension of .htm or .html). purpose of explanation, here simple javascript function html escaping:

function htmlescape(text) {     // absolutely necessary     text = text.replace(/&/g, '&amp;'); // has go first     text = text.replace(/</g, '&lt;');      // not needed specific case, yet include     text = text.replace(/>/g, '&gt;');     text = text.replace(/"/g, '&quot;');     text = text.replace(/'/g, '&#39;'); // '&apos;' ok in xhtml , in html5     return text; }