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