nl_tokens: A placeholder can contain have lines of text .
pl_tokens: function PlaceholderLine ( props ) { const { className , length } = props const classes = cx ( 'line' , length , className ) const rest = getUnhandledProps ( PlaceholderLine , props ) const ElementType = getElementType ( PlaceholderLine , props ) return < ElementType { ... rest } className = { <mask> } / > }