Components

Anchor

A structural primitive to enable CSS Anchor Positioning on stuff.

Always Visible

Floating content that is always shown.

Floating content

Astro

---
import { Anchor } from "@opui/astro"
---

<Anchor>
  <button>Hover me</button>
  <span
    slot="anchored"
    style="background: var(--surface-2); padding: var(--size-2) var(--size-3); border-radius: var(--radius-2); box-shadow: var(--shadow-3);"
    >Floating content</span
  >
</Anchor>

Output

<span class="ui-anchor" style="">
  <button>Hover me</button>
  <span class="ui-anchor-floating">
    <span
      style="
        background: var(--surface-2);
        padding: var(--size-2) var(--size-3);
        border-radius: var(--radius-2);
        box-shadow: var(--shadow-3);
      "
      >Floating content</span
    >
  </span>
</span>

Hover Trigger

Set trigger="hover". The component adds interestfor and popover="hint" declaratively.

Add interestfor, commandfor, and command="toggle-popover" to the anchor trigger so touch devices can tap to show the floating content.

Tooltip content

Astro

---
import { Anchor, Button } from "@opui/astro"
---

<Anchor trigger="hover" id="anchor-hover">
  <Button
    interestfor="anchor-hover"
    commandfor="anchor-hover"
    command="toggle-popover">Hover me</Button
  >
  <span slot="anchored"
    ><div class="ui-card ui-elevated">Tooltip content</div></span
  >
</Anchor>

Output

<span class="ui-anchor" style="">
  <span interestfor="anchor-hover">
    <button
      interestfor="anchor-hover"
      commandfor="anchor-hover"
      command="toggle-popover"
      class="ui-button"
    >
      Hover me
    </button>
  </span>
  <span class="ui-anchor-floating" id="anchor-hover" popover="hint">
    <span><div class="ui-card ui-elevated">Tooltip content</div></span>
  </span>
</span>

Used By

API

Prop	Type	Default	Description
`alignment`	`string`	`"start end"`	Any valid `position-area` value. Controls where the floating content is placed.
`trigger`	`"always" \| "hover"`	`"always"`	When set to `"hover"`, wraps the anchor slot in an `interestfor` invoker and uses `popover="hint"` on the floating element.

Browser support

See also the full browser support guide.

Installation

anchor.css

@layer components.root {
  :where(.ui-anchor) {
    anchor-name: --anchor;
    anchor-scope: --anchor;
    display: inline-block;
    inline-size: fit-content;

    /* Always-visible */
    & > .ui-anchor-floating:not([popover]) {
      block-size: max-content;
      inline-size: max-content;
      position: absolute;
      position-anchor: --anchor;
      position-area: var(--anchor-position-area, start end);
      translate: var(--_anchor-tx, 0) var(--_anchor-ty, 0);
    }

    /* Hover-triggered */
    & > .ui-anchor-floating[popover] {
      inset: unset;
      margin: 0;
      position: absolute;
      position-area: var(--anchor-position-area, start end);
      translate: var(--_anchor-tx, 0) var(--_anchor-ty, 0);
    }
  }
}