css selectors - Append css to a class using a different class on the same element -

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i want add opacity: 1; .main class (as itself, , not .main.flow) when .flow added can affect .main.secondary.

something similar using mouse events (hover, active).

.main {     opacity: 0; } 
<div class="main flow">     <div class="not-main">     </div> </div>  <div class="main secondary"> </div>

i'm limited structure of html i'm modding css. possible using css?

you'll have select both .main.flow , other .main element relative it.

are .main elements siblings, "flow" class being applied first of them?

if so:

.main {     opacity: 0; }  .main.flow, .main.flow + .main {     opacity: 1; }




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