Forms don't allow text input when in fullscreen

Forms don't allow text input when in fullscreen

When You click the full-screen button using chrome on this site the text
input doesn't work properly, space works but text doesn't. The code that
is used to make it full screen is
function launchFullScreen(element) {
if (element.requestFullScreen) {
element.requestFullScreen();
} else if (element.mozRequestFullScreen) {
element.mozRequestFullScreen();
} else if (element.webkitRequestFullScreen) {
element.webkitRequestFullScreen();
}
}
and onClick="launchFullScreen(document.documentElement);"
Thanks for any help