dpaste and warning upon leaving page

[Jack Stouffer via Digitalmars-d]

On Tuesday, 10 May 2016 at 16:39:05 UTC, Anonymouse wrote:
> I just had a PEBCAK moment where I was composing a large-ish 
> snippet on dpaste, then accidentally left the page by clicking 
> the back button on my mouse. Going back to the page I see my 
> changes were lost.
>
> Could we maybe add a warning when leaving the page if the 
> content has been changed? I think it's the onbeforeunload 
> event, but I don't know javascript well.
>
> http://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_onbeforeunload_dom

IIRC chrome does this automatically.