This is the same tracker as the desktop app, with what a web page can't do turned off:
global hotkeys (keys work only while this page has focus), gamepad and voice commands
pop-out windows: HUDs, the broadcast window and other separate windows
co-op sync, auto-update, and fake clicks or mouse movement
Settings and the autosave are kept in this browser. Other saves are also downloaded; open them with Load Save on the start screen.
For everything else, get the desktop app.