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CSS

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CSS Base

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HTML 

              
                  <div class="c-mm">
    <!--
      Use checkbox-hack:
      <input type="checkbox" id="anim1" name="slideshow" hidden />
      <label class="c-mm__play" for="anim1"><span data-css-icon="play"><i></i></span></label> 
    -->
    <details>
      <summary class="c-mm__play"><span data-css-icon="play"><i></i></span></summary>
      <span hidden></span>
    </details>
    <div class="c-mm__inner">

      <figure class="c-mm__frame" style="--animn:kenburns-bottom-left;--index:0;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/01.jpg" />
        <figcaption data-caption="bottom left">Holiday Memories<div>Bornholm</div></figcaption>
      </figure>

      <figure class="c-mm__frame" style="--animn:kenburns-top;--index:1;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/02.jpg" />
        <figcaption data-caption="bottom left">Rocky Beach</figcaption>
      </figure>

      <figure class="c-mm__frame" style="--animn:kenburns-bottom-left;--index:2;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/03.jpg" />
        <figcaption data-caption="top right">Opal Lake </figcaption>
      </figure>

      <figure class="c-mm__frame" style="--animn:kenburns-top;--index:3;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/04.jpg" />
        <figcaption data-caption="bottom left">Melsted</figcaption>
      </figure>

      <figure class="c-mm__frame" style="--animn:kenburns-bottom-left;--index:4;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/05.jpg" />
        <figcaption data-caption="top right">Bigfoot<div>Stone Edition</div></figcaption>
      </figure>

      <figure class="c-mm__frame" style="--animn:kenburns-top;--index:5;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/06.jpg" />
        <figcaption data-caption="top left">Hammer Lake<div>Opal Lake</div></figcaption>
      </figure>

      <figure class="c-mm__frame" style="--animn:kenburns-bottom-left;--index:6;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/07.jpg" />
        <figcaption data-caption="bottom left">Wild Garlic</figcaption>
      </figure>

      <figure class="c-mm__frame" style="--animn:kenburns-top;--index:7;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/08.jpg" />
        <figcaption data-caption="top right">Wall Of Rock</figcaption>
      </figure>

      <figure class="c-mm__frame" style="--animn:kenburns-bottom-left;--index:8;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/09.jpg" />
        <figcaption data-caption="bottom left">Coastal Path<div>Gudhjem</div></figcaption>
      </figure>

      <figure class="c-mm__frame" style="--animn:kenburns-bottom-left;--index:9;">
        <img class="c-mm__img" src="https://assets.stoumann.dk/img/movie/10.jpg" />
        <figcaption data-caption="bottom left">Sunset At Bokul<div>Gudhjem</div></figcaption>
      </figure>
    </div>
  </div>

  <p>The &lt;details&gt;-tag is here used to play/pause the slideshow, using it's [open]-state (and :not([open])) to set two CSS Custom Properties, controlling the "animation-play-state" of both the overall slideshow and the animations of the individual slides. The images are from the most beautiful island in Denmark — the island of Bornholm, and are &copy; me!</p>
!

CSS 

              
                 @import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Castoro&family=Smythe&display=swap'); 
.c-mm {
  --h: 9;
  --w: 16;
  --z: 100; /* z-index begin */
  --animdur: 18000ms; /* 3 times the duration */
  --animtf: ease-out;
  --dist: clamp(0.75rem, 10vw, 1.5rem);
  --slides: 20;
  font-size: 1rem;
  position: relative;
}
.c-mm::before {
  content: '';
  display: block;
  padding-bottom: calc(var(--h) / var(--w) * 100%);
}
[data-caption] {
  --b: var(--dist);
  --l: var(--dist);
  --r: initial;
  --t: initial;

  bottom: var(--b);
  color: rgba(255, 255, 255, 0.9);
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(1rem, 10vw, 4rem);
  left: var(--l);
  line-height: 1;
  position: absolute;
  right: var(--r);
  top: var(--t);
}
[data-caption] div,
[data-filter] div {
  font-family: 'Castoro', serif;
  font-size: 50%;
}

[data-caption*="bottom"] {
  --b: var(--dist);
  --t: auto;
}
[data-caption*="left"] {
  --l: var(--dist);
  --r: auto;
}
[data-caption*="right"] {
  --l: auto;
  --r: var(--dist);
}
[data-caption*="top"] {
  --b: auto;
  --t: var(--dist);
}

.c-mm__frame {
  --animps: paused;
  --img-animps: paused;
  --index: 0;
  animation: autoplay var(--animdur) infinite;
  animation-delay: calc((var(--index) * var(--animdur)) / 3);
  animation-play-state: var(--animps);
  box-sizing: border-box;
  height: 100%;
  margin: 0;
  opacity: 0;
  overflow: hidden;
  padding: 0;
  position: absolute;
  top: 0;
  width: 100%;
}

/* Alas, we cannot use var() in nth-selector :-(, so we need code for 3-20 items */
.c-mm__frame:nth-last-child(3):first-child, 
.c-mm__frame:nth-last-child(3):first-child ~ .c-mm__frame {
  animation-duration: var(--animdur);
}
.c-mm__frame:nth-last-child(4):first-child, 
.c-mm__frame:nth-last-child(4):first-child ~ .c-mm__frame {
  animation-duration: calc((4/3) * var(--animdur));
}
.c-mm__frame:nth-last-child(5):first-child, 
.c-mm__frame:nth-last-child(5):first-child ~ .c-mm__frame {
  animation-duration: calc((5/3) * var(--animdur));
}
.c-mm__frame:nth-last-child(6):first-child, 
.c-mm__frame:nth-last-child(6):first-child ~ .c-mm__frame {
  animation-duration: calc((6/3) * var(--animdur));
}
.c-mm__frame:nth-last-child(7):first-child, 
.c-mm__frame:nth-last-child(7):first-child ~ .c-mm__frame {
  animation-duration: calc((7/3) * var(--animdur));
}
.c-mm__frame:nth-last-child(8):first-child, 
.c-mm__frame:nth-last-child(8):first-child ~ .c-mm__frame {
  animation-duration: calc((8/3) * var(--animdur));
}
.c-mm__frame:nth-last-child(9):first-child, 
.c-mm__frame:nth-last-child(9):first-child ~ .c-mm__frame {
  animation-duration: calc((9/3) * var(--animdur));
}
.c-mm__frame:nth-last-child(10):first-child, 
.c-mm__frame:nth-last-child(10):first-child ~ .c-mm__frame {
  animation-duration: calc((10/3) * var(--animdur));
}

.c-mm__img { 
  animation-direction: alternate;
  animation-duration: calc(var(--animdur) / 1.5);
  animation-fill-mode: both;
  animation-iteration-count: infinite;
  animation-name: var(--animn);
  animation-play-state: var(--img-animps);
  animation-timing-function: var(--animtf);
  height: 100%;
  object-fit: cover;
  object-position: var(--x, 50%) var(--y, 50%);
  position: absolute;
  top: 0;
  width: 100%;
  will-change: transform;
}

.c-mm__inner {
  height: 100%;
  position: absolute;
  top: 0;
  width: 100%;
}

.c-mm__play {
  --size: clamp(3rem, 10vw, 4rem);
  align-items: center;
  background: rgba(235,235,235,0.9); 
  box-shadow: 0px 4px 6px -1px rgba(0, 0, 0, 0.1), 0px 2px 4px -1px rgba(0, 0, 0, 0.06);
  border-radius: 50%;
  display: flex;
  height: var(--size);
  justify-content: center;
  position: absolute;
  bottom: var(--dist);
  right: var(--dist);
  user-select: none;
  width: var(--size);
  z-index: calc(var(--z) + var(--slides) + 1); 
}

.c-mm__play:hover {
  background: rgba(255,255,255,0.9); 
}

/* CHECKBOX-HACK STATE */
[name="slideshow"]:checked ~ .c-mm__inner .c-mm__frame {
  --animps: running;
  --img-animps: running;
}
[name="slideshow"]:not(:checked)  ~ .c-mm__inner .c-mm__frame {
  --animps: paused;
  --img-animps: paused !important;
}
[name="slideshow"]:not(:checked) ~ .c-mm__inner .c-mm__frame:first-of-type {
  opacity: 1;
}
[name="slideshow"]:checked + label [data-css-icon*="play"] i::after {
  --cpa: polygon(40% 0%,0% 0%,0% 100%,40% 100%,40% 0%,60% 0%,100% 0%,100% 100%,60% 100%,60% 0%);
}

/* DETAILS STATE */
details[open] ~ .c-mm__inner .c-mm__frame {
  --animps: running;
  --img-animps: running;
}
details:not([open])  ~ .c-mm__inner .c-mm__frame {
  --animps: paused;
  --img-animps: paused !important;
}
details:not([open]) ~ .c-mm__inner .c-mm__frame:first-of-type {
  opacity: 1;
}
details[open] summary [data-css-icon*="play"] i::after {
  --cpa: polygon(40% 0%,0% 0%,0% 100%,40% 100%,40% 0%,60% 0%,100% 0%,100% 100%,60% 100%,60% 0%);
}
summary::marker { display: none; }
summary::-webkit-details-marker { display: none; }

@keyframes autoplay {
  0.1% { --img-animps: running; opacity: 0; z-index: calc(var(--z) + var(--slides)) }
  5% { opacity: 1 }
  50% { opacity: 1 }
  51% { --img-animps: paused }
  100% { opacity: 0; z-index: var(--z) }
}

/* ----------------------------------------------
 * Generated by Animista on 2020-11-25 9:5:10
 * Licensed under FreeBSD License.
 * See http://animista.net/license for more info. 
 * w: http://animista.net, t: @cssanimista
 * ---------------------------------------------- */
@keyframes kenburns-top{0%{transform:scale(1) translateY(0);transform-origin:50% 16%}100%{transform:scale(1.25) translateY(-15px);transform-origin:top}}
@keyframes kenburns-top-right{0%{transform:scale(1) translate(0,0);transform-origin:84% 16%}100%{transform:scale(1.25) translate(20px,-15px);transform-origin:right top}}
@keyframes kenburns-right{0%{transform:scale(1) translate(0,0);transform-origin:84% 50%}100%{transform:scale(1.25) translateX(20px);transform-origin:right}}
@keyframes kenburns-bottom-right{0%{transform:scale(1) translate(0,0);transform-origin:84% 84%}100%{transform:scale(1.25) translate(20px,15px);transform-origin:right bottom}}
@keyframes kenburns-bottom{0%{transform:scale(1) translateY(0);transform-origin:50% 84%}100%{transform:scale(1.25) translateY(15px);transform-origin:bottom}}
@keyframes kenburns-bottom-left{0%{transform:scale(1) translate(0,0);transform-origin:16% 84%}100%{transform:scale(1.25) translate(-20px,15px);transform-origin:left bottom}}
@keyframes kenburns-left{0%{transform:scale(1) translate(0,0);transform-origin:16% 50%}100%{transform:scale(1.25) translate(-20px,15px);transform-origin:left}}
@keyframes kenburns-top-left{0%{transform:scale(1) translate(0,0);transform-origin:16% 16%}100%{transform:scale(1.25) translate(-20px,-15px);transform-origin:top left}}

/* FROM CSS-ICONS-PEN, slightly modified */		
[data-css-icon] {
  --icon-size: 1.5rem;
  --size: 3.75rem;
  --bdrs: 50%;
  --c: currentcolor;
  align-items: center;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
}
[data-css-icon] i {
  align-items: center;
  border-radius: var(--bdrs);
  box-sizing: content-box;
  display: inline-flex;
  height: var(--size);
  justify-content: center;
  position: relative;
  width: var(--size);
}
[data-css-icon] i::after {
  --cpa: none;
  --h: var(--icon-size);
  --w: var(--icon-size);
  background-color: var(--bgcl);
  clip-path: var(--cpa);
  content: "";
  display: inline-block;
  height: var(--h);
  margin: 0;
  width: var(--w);
}
[data-css-icon*="play"] i::after {
  --bgcl: var(--c);
  --cpa: polygon(16% 0%,15% 100%,100% 50%);
}

/* SAFARI HACK */
@media not all and (min-resolution:.001dpcm) { 
  @supports (-webkit-appearance:none) {
    summary [data-css-icon] i {
      right: -2px;
      top: 2px;
    }
  }
}
body { font-family: system-ui, sans-serif; margin: 0 auto; max-width: 54rem; padding: 1rem }
p {  color: silver }
!

JS 

              
                /* JavaScript Not Required! */
!
999px

Console