It should pretty print html element compound tag names
<h{{ header_number }}></h{{ header_number }}>
<{{ header_type }}-header></{{ header_type }}-header>

It should print compound names on a single line, even if long
printWidth: 1
<h{{ header_number | round }}></h{{ header_number | round }}>

It should print compound names with attributes as it would
printWidth: 1
<h{{ header_number | round }}
  attr="value"
  disabled
></h{{ header_number | round }}>