Disable Browser Shortcut Keys

I am trying to create, essentially, a 'kiosk' I have an web application that I want to be the only thing accessible on screen. I know chrome has a 'kiosk' mode (shortcut: chrome.exe --kiosk www.url.com). That takes care of the auto-fullscreen, but disables very few shortcuts (perhaps only f11). With a bit of help from the internet, I wrote out some javascript that gets most of the job done. The code is as follows: ``` window.onload = function() { window.document.body.onkeydown = function() { if (event.ctrlKey) { event.stopPropagation(); event.preventDefault(); try { event.keyCode = 0; // this is a hack to capture ctrl+f ctrl+p etc } catch (event) { } return false; } return true; // for keys that weren't shortcuts (e.g. no ctrl) then the event is bubbled } } ``` This takes care of things like ctrl+f, ctrl+p, etc. Unfortunately, it does not disable shortcuts such at ctrl+t, ctrl+n, f5, etc. Is it even possible to disable these, or am I chasing a rainbow here? I don't care if it's javascript, settings, whatever, but I would really like to do it without a plugin.