Add class to featured image?

  • I am trying to use Cloudinary to make my page responsive and create breaking points for images on mobile. To do this I need to set the img tag parameters.

    <img
    data-src=”https://res.cloudinary.com/demo/image/upload/w_auto,c_scale/smiling_man.jpg&#8221;
    class=”cld-responsive”>

    I tried adding cld-responsive to CSS Style section, and possibly if this is valid method my JS on the page may have issues.

    I love your plugin so-far, but I need to figure this out to not serve huge featured images to mobile.

    BTW, Cloudinary cites using a plugin like yours to use their images as WP featured images.

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