• [ Moderator note: moved to Fixing WordPress. ]

    Hello,

    I am working on the optimization of the images of a wordpress site.
    I defined several sizes in my functions.php file, via the add_image_size. However, I want to use the attributes “srcset” to managed the size of the images. I was wondering if I have to have several sizes of the same image or not (which involved to upload several pictures).
    For example :
    srcset= "cat.jpeg / cat-480.jpeg / cat-720.jpeg"

    And for the attribute “size”, I just have to specified the condition about the device, right?
    For example :
    sizes="(max-width: 480px) 'small_size', (max-width: 720px) 'medium_size', (max-width: 1024px) 'larger_size'"

    I have found the function wp_calculate_image_srcset, in media.php. So, I was wondering, if it will be a good way to write the others sizes after ‘format_313x194’ ?

    <img src="<?php echo $aImg['sizes']['format_313x194']; ?>" alt="<?php echo $aImg['alt'] ?>" />

    Thank you for your comments and answers. Havee a nice day!

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