animation-range-end

/* Giá trị từ khóa hoặc phần trăm độ dài */
animation-range-end: normal;
animation-range-end: 80%;
animation-range-end: 700px;

/* Giá trị phạm vi dòng thời gian có tên */
animation-range-end: cover;
animation-range-end: contain;
animation-range-end: cover 80%;
animation-range-end: contain 700px;

/* Giá trị toàn cục */
animation-range-end: inherit;
animation-range-end: initial;
animation-range-end: revert;
animation-range-end: revert-layer;
animation-range-end: unset;

<div class="content">
  <h1>Content</h1>

  <p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
    tempor incididunt ut labore et dolore magna aliqua. Risus quis varius quam
    quisque id. Et ligula ullamcorper malesuada proin libero nunc consequat
    interdum varius. Elit ullamcorper dignissim cras tincidunt lobortis feugiat
    vivamus at augue.
  </p>

  <p>
    Dolor sed viverra ipsum nunc aliquet. Sed sed risus pretium quam vulputate
    dignissim. Tortor aliquam nulla facilisi cras. A erat nam at lectus urna
    duis convallis convallis. Nibh ipsum consequat nisl vel pretium lectus.
    Sagittis aliquam malesuada bibendum arcu vitae elementum. Malesuada bibendum
    arcu vitae elementum curabitur vitae nunc sed velit.
  </p>
</div>

<div class="animatedElement">

<p>
  Adipiscing enim eu turpis egestas pretium aenean pharetra magna ac. Arcu
  cursus vitae congue mauris rhoncus aenean vel. Sit amet cursus sit amet
  dictum. Augue neque gravida in fermentum et. Gravida rutrum quisque non tellus
  orci ac auctor augue mauris. Risus quis varius quam quisque id diam vel quam
  elementum. Nibh praesent tristique magna sit amet purus gravida quis. Duis
  ultricies lacus sed turpis tincidunt id aliquet. In egestas erat imperdiet sed
  euismod nisi. Eget egestas purus viverra accumsan in nisl nisi scelerisque.
  Netus et malesuada fames ac.
</p>
<p>

<label>
  <input type="checkbox" /> Add <code>animation-fill-mode: forwards;</code>
</label>

  </p>
</div>

.animatedElement {
  background-color: deeppink;
  animation: appear 1ms linear;
  animation-timeline: view();
  animation-range-end: exit 25%;
}

@keyframes appear {
  from {
    background-color: rebeccapurple;
    opacity: 0;
    transform: scaleX(0);
  }

  to {
    background-color: darkturquoise;
    opacity: 0.75;
    transform: scaleX(0.75);
  }
}

:has(:checked) .animatedElement {
  animation-fill-mode: forwards;
}

.animatedElement {
  width: 300px;
  height: 200px;
  margin: 0 auto;
  background-color: deeppink;
}

:has(:checked) .animatedElement {
  animation-fill-mode: both;
}

.content {
  width: 75%;
  max-width: 800px;
  margin: 0 auto;
}

p,
h1 {
  font-family: "Helvetica", "Arial", sans-serif;
}

h1 {
  font-size: 3rem;
}

p {
  font-size: 1.5rem;
  line-height: 1.5;
}
@supports not (animation-range-end: normal) {
  body::before {
    content: "Your browser does not support the 'animation-range-end' property.";
    color: black;
    background-color: wheat;
    display: block;
    text-align: center;
    padding: 1rem 0;
  }
}