Ok, I wrote that it worked for featured images. I don’t really think that it does that actually.
I have created these image sizes:
add_image_size( 'pf-smallest', 260, 9999);
add_image_size( 'pf-small', 400, 9999);
add_image_size( 'pf-medium', 580, 9999);
add_image_size( 'pf-large', 600, 9999);
add_image_size( 'pf-largest', 755, 9999);
add_image_size( 'mobile-thumb-large', 440, 207, true );
add_image_size( 'mobile-thumb-small', 80, 80, true );
But the HTML I get is the following:
<img width=”700″ height=”329″ src=”https://squazz-df5.kxcdn.com/wp-content/uploads/2014/12/IMG_1773-700×329.jpg” srcset=”https://squazz-df5.kxcdn.com/wp-content/uploads/2014/12/IMG_1773-440×207.jpg 440w, https://squazz.dk/wp-content/uploads/2014/12/IMG_1773-700×329.jpg 700w” class=”attachment-thumb-large wp-post-image” alt=”3 m?neders Israelsk visum”>
The 700w image size is from the theme, the 440w I try to convince myself is my own creation. But then I don’t get why the RICG plugins does not fetch my other images and offers these?