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The “charset” attribute on the “script” element is obsolete.

A <script> element has been found that is using the now obsolete charset attribute. You can safely remove this attribute.

For example, this is using both type and charset attributes, with their default values. Both can be removed:

<script src="app.js" type="text/javascript" charset="UTF-8"></script>

and just use this:

<script src="app.js"></script>

Learn more:

Related W3C validator issues

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