How to highlight spaces in a tag? (CSS only) -

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i have tag

<span class="block" style="width:12px;height:17px">&nbsp;tttt&nbsp;ttt&nbsp;ttttt</span>

i want highlight &nbsp;. how can using css?

well there no such way select space, if reason want then, can try this:

<span class="block" style="width:12px;height:17px"><span style="background-color:#f00;">&nbsp;</span>tttt<span style="background-color:#f00;">&nbsp;</span>ttt&nbsp;ttttt</span>

put   within span 

<span style="background-color:#f00;">&nbsp;</span>

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