I was facing a similar issue with the left-side label on the Bar2D javascript/html5 chart in IE9. I found that adding the following doctype declaration:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
before the <html> tag in my file worked beautifully.
Hope that helps!