A workaround exists, but it is an unfortunate loss of functionality:
Internet Explorer (v9, v10, v11) can handling modern style rendering with a combination of
<meta http-equiv="X-UA-Compatible" content="IE=Edge" /> and disabling the "prefill" feature when creating landing pages.
Roughly speaking, do the following to disable the prefill feature:
Edit Draft for some Landing Page -> Menu -> Form Settings -> uncheck the "Enable Form Prefill" option
I'll trust that template HTML developers will also know what to do for Internet Explorer at the mention of the
<meta http-equiv="X-UA-Compatible" content="IE=Edge" /> meta tag.