<foo data-user="{&quot;name&quot;:&quot;tobi&quot;}"></foo>
<foo data-items="[1,2,3]"></foo>
<foo data-username="tobi"></foo>
<foo data-escaped="{&quot;message&quot;:&quot;Let's rock!&quot;}"></foo>
<foo data-ampersand="{&quot;message&quot;:&quot;a quote: &amp;quot; this &amp; that&quot;}"></foo>
<foo data-epoc="1970-01-01T00:00:00.000Z"></foo>