Keyboard Can not input when open into a page
so, i use JS code to init when i open a page to deal this problem: 
document.getElementById("qtcanvas").focus(); //ok in sdk  qt6.4.1-bata2
otherwise, i must click mainwidget for keyboard input
but, it is lose now:
document.getElementById("screen").focus(); //invliad in sdk  qt6.5.0-bata2
about mouse rightbutton advice: 
document.oncontextmenu = function(){event.returnValue = false;};