I have a got a stock Fedora 25 here, with Intel Sandybridge graphics and webkitgtk+ 2.14.5. When I go to drive.google.com, select a Google-native document and try to edit it in the browser, several of my keypresses go missing. Most notably the arrow keys and backspace don't work. Also some others like '.', some alphabets but not all.
Wayland vs X doesn't make any difference.
*** This bug has been marked as a duplicate of bug 169269 ***