Chrome auto-fill & autocomplete=on not working

I can find a lot of references even on StackOverflow that Chrome Auto-fill functionality should work if autocomplete="on".

However that does not seem to be the case with the latest Chrome I have here (60.0.3112.90). To be precise - default browser autocomplete works fine , but Auto-fill will ignore the field completely.

The code below won't work with Chrome Auto-fill:

<form method="post" name="checkout" url="/">
    <input type="text" name="given-name" autocomplete="on"   />
    <input type="text" name="email"  autocomplete="on"  />
</form>

However, this will work without issues:

<form method="post" name="checkout" url="/">
    <input type="text" name="given-name" autocomplete="given-name"   />
    <input type="text" name="email"  autocomplete="email"  />
</form>

You can easily test it here: https://jsfiddle.net/kw4yjpz4/

Screenshots:

Does it mean that all input fields now have to have autocomplete="[NAME]" for auto-fill to work? Is this a bug in the newest Chrome or intended behaviour?