fetchpriority="high"

Hi, trying to use fetchpriority="high" for the slider on the top of my page. Current code is

<section id="slider" class="slider-element slider-parallax swiper_wrapper min-vh-60 min-vh-md-100 include-header" data-autoplay="7000" data-speed="650" data-loop="true">
  <div class="slider-inner">
    <div class="swiper-container swiper-parent">
      <div class="swiper-wrapper">
        <div class="swiper-slide dark">
          <div class="swiper-slide-bg" style="background-image: url('pics/intimate-wedding-venue3.jpg');"></div>
        </div>
        <div class="swiper-slide">
          <div class="swiper-slide-bg" style="background-image: url('pics/intimate-wedding-venue2.jpg'); background-position: center top;"></div>
        </div>
        <div class="swiper-slide">
          <div class="swiper-slide-bg" style="background-image: url('pics/intimate-wedding-venue1.jpg'); background-position: center top;"></div>
        </div>
        <div class="swiper-slide">
          <div class="swiper-slide-bg" style="background-image: url('pics/an-intimate-wedding-venue.jpg');"></div>
        </div>
      </div>
      <div class="slider-arrow-left"><i class="icon-angle-left"></i></div>
      <div class="slider-arrow-right"><i class="icon-angle-right"></i></div>
      <div class="slide-number">
        <div class="slide-number-current"></div>
        <span>/</span>
        <div class="slide-number-total"></div>
      </div>
      <div class="swiper-pagination"></div>
    </div>
  </div>
</section>

Where is the best place to use this for the images?

Hi, Thank you. I can see examples in img tags of how to us this but my specific slider doesn't have img tags so i was wondering where would be best to use?