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    },
    'text-indent'     => qr/^$re_ndim$/,
    'text-shadow'     => qr/^ $re_ndim \s+ $re_ndim (?: \s+ $re_dim )? (?: \s+ $re_color )? $/x,
    'text-transform'  => list2hash(qw(none capitalize uppercase lowercase)),
    
    'letter-spacing' => qr/^(?:normal\b|$re_ndim)$/,
    'word-spacing'   => qr/^(?:normal\b|$re_ndim)$/,
    'caption-side'   => list2hash(qw(top bottom)),
    'empty-cells'    => list2hash(qw(hide show)),
    'table-layout'   => list2hash(qw(auto fixed)),
    'unicode-bidi'   => list2hash(qw(normal embed bidi-override)),
    'vertical-align' => qr/^(?: $re_ndim | baseline \b | middle \b | su(?:b|per) \b | (?:text-)?(?:top|bottom) \b )$/x,
    'white-space'    => list2hash(qw(normal nowrap pre pre-line pre-wrap)),
    'z-index'        => qr/^(?: auto \b | -?\d+ \b )$/x,
    
    orphans => qr/^\d+\b$/,
    widows  => qr/^\d+\b$/,
    'page-break-after'  => list2hash(qw(auto always avoid left right)),
    'page-break-before' => list2hash(qw(auto always avoid left right)),
    'page-break-inside' => list2hash(qw(auto avoid)),
);