We create Marketo landing pages on subdomains and noticed the forms do NOT show up in IE11 (or Edge). We contacted Marketo and their response was that there is customer code in the Template (bootstrap) that could be affecting it, and also that there is custom CSS on the form that could be affecting it. They said it's beyond their scope of support to help with code issues.
So, we created a test template/landing page/form using clones of the ones that didn't work and I did the following:
1. I removed basically EVERYTHING from the Template source code, other than the form code. So there is no longer ANY custom code.
2. I removed ALL Custom CSS from the form
Naturally, the form still doesn't show in IE11 or Edge.
Below is the URL of our now stripped down test form. I will go back to Marketo support with this same info but they are likely to continue to not be helpful.
Anyone see anything that I still might have overlooked?
FWIW, in Edge's console, this error seems to be a problem: SCRIPT438: SCRIPT438: Object doesn't support property or method 'append'