[Small feature] Backspace button to go to previous page

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Deleted wrote:
And for the time during typing , ms could make it disabled automatically when filling the form, it would solve that unintentional navigation during form filling.

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Deleted  That doesn't always work, which is why I think Google disabled it. The scenario: user fills out some text box. Hits tab to go to the next text box. Types a few letters and hits 'back' without looking carefully. Turns out 'tab' had moved to the next screen element e.g. a button or some link to Help. At this point the text box is not active, and hitting 'back' navigates the browser away from the page. They throught pretty hard about this, and I think it's the right call for most users. I'd be fine having it available as an option though. 

Edit: see an old (2014!) discussion on the topic here: https://bugs.chromium.org/p/chromium/issues/detail?id=413395 

pkasting mentions (comment 46) that they didn't have hard data to figure out the ratio of happy vs unhappy users of the backspace key, but that they got positive response on removing it as a navigation button. There's another less productive discussion about whether it should be an option. The conclusion is "we don't think it should be" from pkasting.