valores negativos en css
Algunas propiedades permiten valores negativos
No se puede en: line-height, padding, border, width, height.
Se pueden usar valores negativos en: word-spacing, letter-spacing, text-indent, vertical-align, margin.
referencias
http://www.ignside.net/man/css/texto.php
http://www.webtaller.com/maletin/articulos/guia-CSS.php
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