If you've been using Babel via babel-standalone to write React components in-line like this:

<script type="text/babel">
  class MyComponent extends React.Component {
    render() {
      return (<p>But what does it mean, Chrome‽</p>);
    }
  }
</script>

You may have noticed that recently an alarming warning started appearing in the Chrome console:

Fetching scripts with an invalid type/language attributes is deprecated and will be removed in M56, around January 2017.

It's OK! This warning is misleading and does not apply to using Babel in this manner. Updating to M56, you'll note that everything still works OK and that the warning disappears.