html - css expression :not with two condition -

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this question has answer here:

i have weird situation cannot make work :not has 2 condition. want hide div in container except having specific class.

for example html

<div id="container">    <div class="show"></div>   <div class="extra"></div>   <div class="about"></div>    <div class="sample1"></div>   .   .   .   <div class="sampleetc"></div>  </div>

now css expression , not working

 #container > div:not(.show), #container > div:not(.about){      display:none;    }

any ideas why not working or css expression this, presume, :not not work 2 condition, or guessing first expression hide .about

i believe can chain :not selector this:

div#container > div:not(.show):not(.about) {     display: none; }

it appears work correctly on this fiddle.


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