On my phone? All the damn time, since I use a lot of jargon and shorthand that it doesn't understand, as well as a few neologisms. But, I'm a much worse typist on my phone.
On my Linux desktop or $dayjob's Windows laptop? Almost never, as it is much less aggressive about replacing what I typed.
At very least there's an OCX for InteractiveHtmlView or some stuff. It's how South Korean banks apps run. I think even the EU-specific "unbundled IE" versions still have that ActiveX / OLE control registered, though it might be crippled.