remove style tag and its contents

There are probably better ways, and indeed, this method assumes there's no whitespace, and that the html is properly formed (it may also need tweaking because I typed it off the top of my head):

XElement tag = XElement.Parse("<span style="font-height:10px;">some text</span>");
XAttribute style = tag.Attribute("style").Value;
if (style != null)
{
    string newTagString = tag.ToString().Replace(string.Format("style=\"{0}\"", style.ToString()), "");
    tag = XElement.Parse(newTagString);
}