Can you explain the discrepancy between these two CSS statements?

Comparing two CSS combinations:

.firstexpression.secondexpression (no space in between)

versus

.firstexpression .secondexpression (with a space in between)

Could you explain the distinction?

Answer №1

One rule applies to elements that have both specified classes, while the other applies to a child element with class .secondexpression that is nested within a parent with class .firstexpression

.firstexpression.secondexpression{
   /* styles */
}

Applies to:

<div class='firstexpression secondexpression'>This style is applied to this specific element</div>

Vs..

.firstexpression .secondexpression{
   /* styles */
}

Applies to:

<div class='firstexpression'>
   <div class='secondexpression'>This style only applies to this nested element</div>
</div>

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