Consider not using external images about starability

I used the Unicode for my implementation. Works great.

[dandv]

@StudioJunkyard: can you link to your version if it happens to be open source?

It's within the styling for LibreCMS, but I can give you the CSS

.rat{
 display:inline-block;
 unicode-bidi:bidi-override;
 direction:rtl
}
.rat > span{
 position:relative;
 width:1em;
 text-shadow:0 1px 1px #000
}
.rat > span.set,
.rat > span.set ~ span{
 color:transparent
}
.rat > span.set:after,
.rat > span.set ~ span:after{
 content:"\2605";
 position:absolute;
 left:0;
 color:gold
}
.rating{
 position:relative;
 float:left
}
.rating:not(:checked) > input{
 position:absolute;
 top:-9999px;
 clip:rect(0,0,0,0)
}
.rating:not(:checked) > label{
 float:right;
 width:1em;
 padding:0 .1em;
 overflow:hidden;
 white-space:nowrap;
 cursor:pointer;
 font-size:150%;
 line-height:1.2;
 color:#ddd;
 text-shadow:1px 1px #bbb, 2px 2px #666,.1em .1em .2em rgba(0,0,0,.5)
}
.rating:not(:checked) > label:before{
 content:'★ '
}
.rating > input:checked ~ label{
 color:#f70;
 text-shadow:1px 1px #c60,2px 2px #940,.1em .1em .2em rgba(0,0,0,.5)
}
.rating:not(:checked) > label:hover,
.rating:not(:checked) > label:hover ~ label{
 color:gold;
 text-shadow:1px 1px goldenrod,2px 2px #B57340,.1em .1em .2em rgba(0,0,0,.5)
}
.rating > input:checked + label:hover,
.rating > input:checked + label:hover ~ label,
.rating > input:checked ~ label:hover,
.rating > input:checked ~ label:hover ~ label,
.rating > label:hover ~ input:checked ~ label{
 color:#ea0;
 text-shadow:1px 1px goldenrod,2px 2px #B57340,.1em .1em .2em rgba(0,0,0,.5)
}
.rating > label:active{
 position:relative;
 top:2px;
 left:2px
}
.rating > label:after{
 content:attr(data-title);
 position:absolute;
 display:block;
 top:auto;
 bottom:30px;
 width:5px;
 height:auto;
 padding-left:7px;
 color:#000;
 font-size:10px;
 font-weight:400;
 text-shadow:0 0 0;
 word-wrap:break-word
}

and the HTML for displaying with the interaction:

<span class="rat">
  <span<?php if($rr['cid']==5)echo' class="set"';?>>☆</span>
  <span<?php if($rr['cid']==4)echo' class="set"';?>>☆</span>
  <span<?php if($rr['cid']==3)echo' class="set"';?>>☆</span>
  <span<?php if($rr['cid']==2)echo' class="set"';?>>☆</span>
  <span<?php if($rr['cid']==1)echo' class="set"';?>>☆</span>
</span>

And here's a front facing review form used from LibreCMS, there are tags that will be no good as they only pertain to the theme system in the CMS, but it should give you an idea on how to implement it.

<review>
  <div id="review" class="list-group">
    <form id="reviewform" target="review" class="list-group-item" method="post" action="core/add_review.php" role="form">
      <input type="hidden" name="id" value="<print content=id>">
      <input type="hidden" name="emailtrap" value="">
      <h4 role="heading">Add a Review</h4>
        <div class="form-group form-group-sm">
          <label class="control-label col-xs-3"><small>Rating</small></label>
            <div class="input-group col-xs-9 rating">
              <input type="radio" id="star5" name="rating" value="5" checked>
              <label for="star5" data-title="5" title="Awesome!">5 stars</label>
              <input type="radio" id="star4" name="rating" value="4">
              <label for="star4" data-title="4" title="Great!">4 stars</label>
              <input type="radio" id="star3" name="rating" value="3">
              <label for="star3" data-title="3" title="Meh!">3 stars</label>
              <input type="radio" id="star2" name="rating" value="2">
              <label for="star2" data-title="2" title="So So!">2 stars</label>
              <input type="radio" id="star1" name="rating" value="1">
              <label for="star1" data-title="1" title="Bad!">1 star</label>
            </div>
          </div>
          <div class="form-group form-group-sm">
            <label for="email" class="control-label col-xs-3"><small>Email</small></label>
            <div class="input-group col-xs-9">
              <input type="text" id="email" class="form-control input-sm" name="email" value="" required aria-required="true" role="textbox">
            </div>
          </div>
          <div class="form-group form-group-sm">
            <label for="name" class="control-label col-xs-3"><small>Name</small></label>
            <div class="input-group col-xs-9">
              <input type="text" id="name" class="form-control input-sm" name="name" value="" role="textbox">
            </div>
          </div>
          <div class="form-group form-group-sm">
            <label for="review" class="control-label col-xs-3"><small>Review</small></label>
            <div class="input-group col-xs-9">
              <textarea id="review" class="form-control input-sm" name="review"  role="textbox"></textarea>
            </div>
          </div>
          <div class="form-group form-group-sm">
            <button type="submit" class="btn btn-success btn-block" role="button">Add Review</button>
          </div>
        </form>
      </div>
      <script>
        $("#reviewform").submit(function(){
          $.post($(this).attr("action"),$(this).serialize(),function(data){
            $("#review").html(data);
          });
          return false;
        });
      </script>
    </review>

[szynszyliszys]

@dandv @StudioJunkyard I've changed external images to base64 encoded sprites. I tried changing sprites to separate encoded star images, but it could cause problems with backwards compatibility for people with starability-slot animation in use. It also added way too many kB of code. Thank you for your feedback and help. :)

Why base64? Inline SVG seemed hard to implement here, as I take advantage of pseudoelements. I like the look of the star graphics used in starability and Unicode characters are a bit different.

Agreed, to have it compatible with unknown places where it could be used, is a bit of a best guess scenario.