they are equal

new ResizeObserver((entries) => {

    // Check to see if the wrapperElement is exists

    if (entries.length === 0 || entries[0].target !== wrapperElement) {

      return;

    }

    // Get the wrapperElement inof

    const newRect = entries[0].contentRect;

    /* your logic */

    /* for example 

    newRect.height + newRect.width */

  }).observe(wrapperElement);