Hi Janice,
When using hint text in Forms 2.0, Marketo actually renders the text as
input placeholders, which are not supported by IE8/IE9. However, there is a workaround for this!
Modernizr is a JS script that will actually detect these older versions of IE and perform backwards-compatible fixes to make newer HTML/CSS features show for older browsers.
Simply place
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.8.3/modernizr.min.js"></script>
inside the <head> tag in your landing page to enable.