WordPress remove default width & height from blog post images

//*** it past in your Function.php no need to edit or anything
//*** but you confirm befor that (it work only if you add post_class in blog post main div)then it will work


// remove width & height attributes from blog post images
function remove_img_attr ($html)
{
    return preg_replace('/(width|height)="\d+"\s/', "", $html);
} 
add_filter( 'post_thumbnail_html', 'remove_img_attr' );

// visit more inf: https://developer.wordpress.org/reference/functions/the_post_thumbnail/

// remove width & height attributes from blog post images

function remove_img_attr ($html)

{

return preg_replace('/(width|height)="\d+"\s/', "", $html);

}

add_filter( 'post_thumbnail_html', 'remove_img_attr' );

// visit more inf: https://developer.wordpress.org/reference/functions/the_post_thumbnail/