wordpress/wp-content/themes/twentyten/editor-style-rtl.css

/*
Theme Name: Twenty Ten
*/
/*
Used to style the TinyMCE editor.
*/
html .mceContentBody{
	direction: rtl;
	unicode-bidi: embed;
	float: right;
	width: 640px;
}
* {
	font-family: Arial, Tahoma, sans-serif;
}
/* Text elements */
ul, ol {
	margin: 0 -18px 18px 0;
}
dd {
	margin-right: 0;
}
blockquote {
	font-style: normal;
}
table {
	text-align: right;
	margin: 0 0 24px -1px;
}