I often use `classes` as a means to identify a related set of elements, for example:

```
<input value="10" class="sum-this" />
<input value="20" class="sum-this" />
<input value="30" class="sum-this" />

```

The `sum-this` class has no CSS, and isn't defined in any CSS files -it's simply used in some jQuery - for example:

```
var total = 0;
$(".sum-this").each(function(i, el){
  total += parseInt($(el).val());
});
console.log(total); // 60?

```

**Is there a correct way to do this? Should I use another attribute? `rel` or `data-*`?**