Using keyboard shortcuts on buttons when publishing to HTML?

I have a Captivate 8 project where I have several text input fields, and I've made them go to the next slide.  I took the "Submit" button for the text entry, made it invisible, put it in the bottom corner, and assigned it a TAB shortcut key to advance to the next slide.  This works great when I publish to SWF, but doesn't work at all when publishing to HTML5.

Does HTML5 have issues with shortcut keys assigned to buttons?  Do I need to do something on my end?

Thanks