no support for onbeforeunload
Submitted by Emmanuel Touzery
Epiphany does not honor onbeforeunload.
It has some detection when some elements of a form are entered and a form is not submitted, so this reduces the risk of data-loss because of this, however there will be difference of behaviour where IMO epiphany users are disadvantaged, for instance the flickr uploader will warn you if you try to close the browser while uploading pictures: not so in epiphany.
Version: git master