If you are using the responsive web layouts on your WordPress site, but when you are using an image inside your WordPress posts and pages and also want to add extra responsive CSS class in every image you used on your WordPress site, then this tutorial is specially designed for you.
Keep your close attention in this tutorial as I am going to share how to add CSS class in every image for WordPress post.
Below code will add the “additional-class” CSS class within the edit pane when you insert any new images and it will not affect pre-existing ones.
$class .= ' additional-class';
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