Accidentally found a keyboard shortcut to see and enable additional keyboard shortcuts, can determine what key combination it was.
While working, I accidentally hit a combination of keys that opened a list of all keyboard shortcuts as an overlay on the current page. I can't figure out what that combination was. I think it involved "?" but no combination of "ctrl" "shift" or "alt" with that key seem to work.
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Do you mean this page: Help > Keyboard Shortcuts
Resolved it. Was page specific to gmail. My mistake.