Comment by anderskaseorg

It’s the server (probably WordPress’s fault), not JS. – is an en dash:

    $ curl -s https://www.punctuationmatters.com/en-dash-em-dash-hyphen/ | grep -A6 '<h3>What'
    <h3>What do they look like?</h3>
    <table style="height: 139px;" width="289">
    <tbody>
    <tr>
    <td><strong> &#8211;</strong></td>
    <td><strong> hyphen </strong></td>
    </tr>