prettier/tests/css_attribute/custom-selector.css

@custom-selector :--icon i[class^='icon-'], i[class*=' icon-'];
@custom-selector :--icon i[ class ^= 'icon-' ], i[ class *= ' icon-' ];
@custom-selector
:--icon
i[
class
^=
'icon-'
]
,
i[
class
*=
' icon-'
]
;