CSS get siblings before element?

Question:

Well basically, I have the following structure, where when hover is activated on an element, the brothers on the right should be given a unique style, while the ones on the left should be styled differently. I currently have the same code working fine in JS to style the siblings to the left of the element in hover , however, I feel annoyed that I can't do everything just with CSS, so the question, is it possible to select all siblings before the selected one using CSS?

.main{
  width: 100%;
  height:50px;
}
.child{
  width:50px;
  height:50px;
  
  background-color:#F00;
  display: inline-block;
  margin-right: 5px;
}

.child:hover{
  background-color: #0F0;
}
/*define cor para todos os siblings depois deste*/
.child:hover ~ .child{
  background-color: #00F;
}
<div class="main">
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
</div>

Answer:

CSS doesn't have a selector that solves anteriority, but in your case a "double hover" can solve it (it works in IE11, inclusive):

.main{
  width: 100%;
  height:50px;
}

.child{
  width:50px;
  height:50px;
  
  background-color:#F00;
  display: inline-block;
  margin-right: 5px;
}

.main:hover .child{         /* o hover no main aciona a mudança no resto */
  background-color: #FF0;
}

.main:hover .child:hover,
.child:hover{
  background-color: #0F0;
}

.child:hover ~ .child{
  background-color: #00F;
}

 
<div class="main">
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
  <div class="child"></div>
</div>
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