If you set background image to some tag inline, you still able to control it with css and media queries, !important is still working =) <div id=”image” style=”background:url(image.jpg);”> !important still has priority over inline style and you can use in your media queries. #image{ background:url(another-image.jpg) !important; }
Responsive header image
You can use wp_is_mobile() to check whether it is a mobile device or desktop user. <?php if ( wp_is_mobile() ) : ?> /* Display and echo mobile specific stuff here */ <?php else : ?> /* Display and echo desktop stuff here */ <?php endif; ?>
My theme header is stuck on a low resolution image?
Why does WordPress list all image sizes in srcset even if they’re larger?
About Custom Email Template Design Responsive
Button and Countdown overlapping mobile menu
Whitespace between logo and site title in Twenty Twenty-Two
Efficient wp mobile menu
You can remove everything following the line /* =Responsive Structure ———————————————– */ up until in the style.css for Twenty Eleven /* =Print ———————————————– */ and it will get rid of all the media queries which are based on the size of the page.