Bootstrap 3 collapse change chevron icon on click

by

Pure CSS.

HTML part:

   <a data-toggle="collapse" href="#collapseExample" 
      aria-expanded="false" aria-controls="collapseExample">
        Open/Close collapse
        <i class="fa fa-chevron-right pull-right"></i>
        <i class="fa fa-chevron-down pull-right"></i>
    </a>

The key element here is aria-expanded=”false” or “true”

CSS:

a[aria-expanded=true] .fa-chevron-right {
   display: none;
}
a[aria-expanded=false] .fa-chevron-down {
   display: none;
}

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