electron/spec/fixtures/api/beforeunload-false.html

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HTML

<html>
<body>
<script type="text/javascript" charset="utf-8">
// Only prevent unload on the first window close
var unloadPrevented = false;
window.onbeforeunload = function() {
setTimeout(function() {
require('electron').remote.getCurrentWindow().emit('onbeforeunload');
}, 0);
if (!unloadPrevented) {
unloadPrevented = true;
return false;
}
}
</script>
</body>
</html>