That seems pretty reasonable to me. +ainslie in case he has any hesitations

Do AltGr+Left.

I just read on hacker news you removed "Backspace to go back", and I wanted to ask if you can do the same please for "ALT+LEFT ARROW". 

Because in a very similar to the related bug, when people want to type Unicode fancy chars on textboxes they are kicked BACK in history. 
Step to reproduce:
1. focus an input on a form
2. press "ALT+4" (4 of numeric keypad)
3. if the browser does not NAVIGATES BACK, then press NUM LOCK, and try to do ALT+4 (4 of numeric keypad)

You will navigate back, that is not expected. Most of the time we just want to type the fancy ♦

tito: I think it's unlikely we'll change alt+left, but just so I understand the problem, what OS are you on where alt+4 inserts a character?

It will on Windows.

Note that on Windows, Alt-2 will insert a smiley whether or not numlock is on, but Alt-4 will insert a diamond if and only if numlock is on -- if it's off, we intercept this and go back _even when the focus is in an editable field_.  You might say "how many people use Alt-4", but it's not just alt-4 that's affected -- it's any alt+number sequence that contains a 4 (or, if you can go forward, a 6).  Because alt+number sequence is the easiest way to enter almost any non-latin character on a US keyboard, this is actually pretty bad.

We should probably make it so these don't navigate when focus is in an editable area, so that alt-left/right is at least no more damaging than backspace was.

_right_-Alt (AKA Alt-Gr) + arrow-key actually changes the display driver's screen orientation. So in stead of going one page back, my screen tilts 90 degrees counter clockwise :)

My main argument against this approach: pressing two buttons very far apart means using two hands, this is not only very un-ergonomical but a bit ridiculous, its not like we are operating heavy machinery? Treat the user with some respect... 

How about Page-Up / Page-Down?

#6 - AltGr is treated as Ctrl+Alt, and indeed, it does turn the screen on some systems. 

PageUp/PageDown doesn't exist on smaller notebooks (or are only reachable via Fn), and they already have a function (scroll a whole page up/down). 

I don't know the usage numbers on this, but all keyboards I have (German) feature a key between Lshift and y , which does this: lower: <, upper: >, AltGr: |. Maybe Alt+< for back, Alt+Shift+< for forwards would make sense. 

But I think the takeaway from this is that without statistics on which keys users actually have, it's hard to say which key combination would be the most ideal-  

leoxd: US keyboards don't have a key between LShift and Y. For example,
https://en.wikipedia.org/wiki/British_and_American_keyboards#Windows_keyboards

The key that you are talking about is above the (differently-shaped) Enter key on those keyboards.

#8 - US keyboards also don't have AltGr, so they can use RAlt + Arrow keys with one hand, while keyboards with an angled-brackets key between LShift and y can use Lalt+angled-brackets with one hand. 

There's an incomplete patch for this on https://codereview.chromium.org/2013293002/ if anyone wants to read the discussion there and then pick this up.

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