<!DOCTYPE html>
<div>nesting children
<div>component1
a

</div>

<div>component1
b

</div>

<div>component1
+a

<div>inside component1
</div>
</div>

</div>

<div>async component
x
 children:
<div>component1
x1

</div>

<div>nesting children
<div>component1
m

</div>

<div>component1
n

</div>

<div>component1
+a

<div>inside component1
</div>
</div>

</div>

<div>component1
x2

</div>

</div>
