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    The :-moz-only-whitespace pseudo-class matches an element that has no child nodes at all or empty text nodes or text nodes that have only white-space in them. Only when there are element nodes or text nodes with one or more characters inside the element, the element doesn't match this pseudo-class anymore.


    span:-moz-only-whitespace { style properties }


    span:-moz-only-whitespace::before {
        background-color: lime;


      <span> </span>

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    Contributors to this page: Sheppy, Marsf, Fredchat, ethertank, Mw22
    Last updated by: Sheppy,
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