I'm using BrowserStack to test IE9 and I'm having several issues.
First of all, the "Toggle Off-Canvas" button at the top of the Off-Canvas Docs page doesn't work in IE9.
Secondly, I implemented Off-Canvas on a site I'm building. For some reason it will open in IE9, but not close. When I click the close button, it removes the on-canvas overlay but doesn't slide the off-canvas away.