If you want to include HTML and/or CSS in your blog post, try adding this to your theme’s functions.php:
[php]function include_func($atts) {
extract(shortcode_atts(array(
‘html’ => ”,
‘css’ => ”,
), $atts));
if ($css!=”) {
global $stylenum;
if (!isset($stylenum)) $stylenum=0;
$thisstylename=’externalStyle’.$stylenum;
wp_register_style($thisstylename,’/’.$css);
wp_enqueue_style($thisstylename);
$stylenum++;
}
if ($html!=”) {
ob_start();
$filename=getcwd()."/".$html;
include($filename);
$output=ob_get_contents();
ob_end_clean();
return $output;
}
}
add_shortcode(‘include’,’include_func’);[/php]

Usage in a wordpress post:

[include html=”someHtmlFile.html” css=”someCSSFile.css”]

Example:
HTML: http://henrykoren.kmz.me/myHTML.html
[html]<h2 class="inc_example">It Works!</h2>[/html]
CSS: http://henrykoren.kmz.me/myCSS.css
[css]h2.inc_example { color: #f00; }[/css]

Code to include these:
[include html=”myHTML.html” css=”myCSS.css”]

Demo:
[inc html=”myHTML.html” css=”myCSS.css”]

(note: this probably has all sorts of security vulnerabilities…)