The attribute used on the `<script>` element is not allowed.

# How do I fix this ?

Use the `data-*` attributes to attach custom attributes to the element.

The following attributes are allowed for this element:

* src
* type
* charset
* async
* defer
* crossorigin

# Resources

* [Script element](https://www.w3.org/TR/2014/REC-html5-20141028/scripting-1.html#the-script-element)
* [Attribute not allowed](http://stackoverflow.com/questions/27682252/attribute-cf-hash-not-allowed-on-element-script-at-this-point-in-validator-w3)