You may want to show a tooltip when a user hovers over a button, you can use the createTooltip function of the context for this:

<script>
  import { onMount } from 'svelte';

  export let context;

  let infoButtonEl: HTMLButtonElement;

  onMount(() => {
    if (infoButtonEl) {  
      context.createTooltip(infoButtonEl, {  
        message: 'Tooltip text',  
      });  
    }
  })
</script>

<button bind:this={infoButtonEl}>info</button>

<style></style>