Skeleton Svelte Component

Framework7 comes with Skeleton Elements library (aka UI Skeletons, Skeleton Screens, Ghost Elements) - UI for improved perceived performance.
Skeleton Elements library already integrated into Framework7 and you don't have to install it separately. For the full API documentation and more examples check out the official Skeleton Elements for Svelte documentation.
Examples

<Page>
  <Navbar title="Skeleton Elements" />

  <BlockTitle>Skeleton List</BlockTitle>
  <List mediaList class="skeleton-text">
    <ListItem
      title="Title"
      subtitle="Subtitle"
      text="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi lobortis et massa ac interdum."
    >
      <span slot="media">
        <SkeletonBlock style="width: 40px; height: 40px; border-radius: 50%" />
      </span>
    </ListItem>
    <ListItem
      title="Title"
      subtitle="Subtitle"
      text="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi lobortis et massa ac interdum."
    >
      <span slot="media">
        <SkeletonBlock style="width: 40px; height: 40px; border-radius: 50%" />
      </span>
    </ListItem>
  </List>

  <BlockTitle>Skeleton Card</BlockTitle>
  <Card
    class="skeleton-text"
    title="Card Header"
    content="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi lobortis et massa ac interdum. Cras consequat felis at consequat hendrerit."
    footer="Card Footer"
  ></Card>

  <BlockTitle>Loading Effects</BlockTitle>
  <Block strong>
    <Row tag="p">
      <Button fill small round class="col" onClick={() => load('fade')}>Fade</Button>
      <Button fill small round class="col" onClick={() => load('wave')}>Wave</Button>
      <Button fill small round class="col" onClick={() => load('pulse')}>Pulse</Button>
    </Row>
  </Block>
  {#if loading}
    <List mediaList v-if="loading">
      {#each [1,2,3] as n, index (index)}
        <ListItem
          class={`skeleton-text skeleton-effect-${effect}`}
          title="Full Name"
          subtitle="Position"
          text="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi lobortis et massa ac interdum. Cras consequat felis at consequat hendrerit. Aliquam vestibulum vitae lorem ac iaculis. Praesent nec pharetra massa, at blandit lectus. Sed tincidunt, lectus eu convallis elementum, nibh nisi aliquet urna, nec imperdiet felis sapien at enim."
        >
          <span slot="media">
            <SkeletonBlock style="width: 40px; height: 40px; border-radius: 50%" />
          </span>
        </ListItem>
      {/each}
    </List>
  {:else}
    <List mediaList>
      <ListItem
        title="John Doe"
        subtitle="CEO"
        text="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi lobortis et massa ac interdum. Cras consequat felis at consequat hendrerit. Aliquam vestibulum vitae lorem ac iaculis. Praesent nec pharetra massa, at blandit lectus. Sed tincidunt, lectus eu convallis elementum, nibh nisi aliquet urna, nec imperdiet felis sapien at enim."
      >
        <img src="https://placeimg.com/80/80/people/1" style="width: 40px; height: 40px; border-radius: 50%" slot="media" />
      </ListItem>
      <ListItem
        title="Jane Doe"
        subtitle="Marketing"
        text="Cras consequat felis at consequat hendrerit. Aliquam vestibulum vitae lorem ac iaculis. Praesent nec pharetra massa, at blandit lectus. Sed tincidunt, lectus eu convallis elementum, nibh nisi aliquet urna, nec imperdiet felis sapien at enim."
      >
        <img src="https://placeimg.com/80/80/people/2" style="width: 40px; height: 40px; border-radius: 50%" slot="media" />
      </ListItem>
      <ListItem
        title="Kate Johnson"
        subtitle="Admin"
        text="Sed tincidunt, lectus eu convallis elementum, nibh nisi aliquet urna, nec imperdiet felis sapien at enim."
      >
        <img src="https://placeimg.com/80/80/people/3" style="width: 40px; height: 40px; border-radius: 50%" slot="media" />
      </ListItem>
    </List>
  {/if}
</Page>
  

<script>
  import {Page, Navbar, BlockTitle, List, ListItem, SkeletonBlock, Card, Block, Row, Button} from 'framework7-svelte';

  let loading = false;
  let effect = null;

  function load(newEffect) {
    if (loading) return;

    effect = newEffect;
    loading = true;
    setTimeout(() => {
      loading = false;
    }, 3000);
  }
</script>