---
title: "Tabs Slide Indicator"
description: "A pill indicator transition that slides between active tabs"
---

import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";

<VariablesExplorer
  previewSrc="/public/catalog/components/tabs-slide-indicator.json"
  compositionId="tabs-slide-indicator"
  compositionSrc="compositions/components/tabs-slide-indicator.html"
  variables={[{"id":"accent","type":"enum","role":"style","label":"Accent","description":"Fill of the sliding pill. ink is literal; the rest ride the composition theme tokens.","default":"ink","options":[{"value":"ink","label":"Ink"},{"value":"green","label":"Green"},{"value":"blue","label":"Blue"},{"value":"violet","label":"Violet"}]},{"id":"width","type":"enum","role":"layout","label":"Tab width","description":"Width of one tab. The slide the timeline drives is scaled to match, so the pill still lands on the next tab.","default":"standard","options":[{"value":"compact","label":"Compact"},{"value":"standard","label":"Standard"},{"value":"wide","label":"Wide"}]},{"id":"shape","type":"enum","role":"style","label":"Shape","description":"Corner radius of the track and the pill.","default":"pill","options":[{"value":"pill","label":"Pill"},{"value":"rounded","label":"Rounded"},{"value":"square","label":"Square"}]},{"id":"labels","type":"string","role":"content","label":"Labels","description":"The tab names, separated by commas. Two or more names rebuild the row.","default":"Plan,Debug,Ask"}]}
>

```html tabs-slide-indicator.html
<!--
  Tabs Slide Indicator - transitions.dev-inspired primitive for HyperFrames.

  Paste the markup, CSS and script into a composition. Use the timeline
  integration note at the bottom as the starting point for deterministic GSAP
  animation.

  Variables. The script reads each one, falls back to the declared default on
  anything missing or unrecognised, and writes the result as a custom property
  the CSS below consumes. The timeline recipe at the bottom is untouched by
  them: it keeps sliding the pill one tab to the right, and these decide how
  wide that tab is, what the pill looks like and what the tabs say.

    - accent (ink | green | blue | violet, default ink): fill of the sliding
      pill. ink is a literal near-black; the other three ride the composition's
      own brand, accent and accent-2 tokens and fall back to that same ink when
      the composition declares none. The labels sitting on it stay white, so all
      four keep the active tab readable.
    - width (compact | standard | wide, default standard): width of one tab,
      72px, 86px or 104px. The slide the timeline drives is scaled by the same
      ratio, so the pill still lands exactly on the next tab rather than
      stopping short or overshooting it.
    - shape (pill | rounded | square, default pill): corner radius of the track
      and the pill, 999px, 12px or 4px.
    - labels (text, default "Plan,Debug,Ask"): the tab names, separated by
      commas. Two or more names rebuild the row, one name or none leaves the
      authored markup alone, since a single tab has nowhere to slide to.

  With the defaults, this renders three 86px tabs in a light pill track. The
  near-black pill and white active label move from the first tab to the second.
-->

<div
  class="hf-transition-tabs-slide-indicator"
  data-composition-variables='[
    { "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Fill of the sliding pill. ink is literal; the rest ride the composition theme tokens.", "default": "ink", "options": [{ "value": "ink", "label": "Ink" }, { "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
    { "id": "width", "type": "enum", "role": "layout", "label": "Tab width", "description": "Width of one tab. The slide the timeline drives is scaled to match, so the pill still lands on the next tab.", "default": "standard", "options": [{ "value": "compact", "label": "Compact" }, { "value": "standard", "label": "Standard" }, { "value": "wide", "label": "Wide" }] },
    { "id": "shape", "type": "enum", "role": "style", "label": "Shape", "description": "Corner radius of the track and the pill.", "default": "pill", "options": [{ "value": "pill", "label": "Pill" }, { "value": "rounded", "label": "Rounded" }, { "value": "square", "label": "Square" }] },
    { "id": "labels", "type": "string", "role": "content", "label": "Labels", "description": "The tab names, separated by commas. Two or more names rebuild the row.", "default": "Plan,Debug,Ask" }
  ]'
>
  <span class="indicator"></span><button style="--hf-tab-index: 0">Plan</button
  ><button style="--hf-tab-index: 1">Debug</button><button style="--hf-tab-index: 2">Ask</button>
</div>

<style>
  .hf-transition-tabs-slide-indicator {
    --hf-tab-x: 0px;
    --hf-tab-offset: calc(var(--hf-tab-x) * var(--hf-tab-step, 1));
    position: relative;
    display: inline-grid;
    grid-template-columns: repeat(var(--hf-tab-count, 3), var(--hf-tab-width, 86px));
    padding: 4px;
    border: 1px solid #e4e4e7;
    border-radius: var(--hf-tab-radius, 999px);
    background: #f4f4f5;
    font-family: Inter, system-ui, sans-serif;
  }
  .hf-transition-tabs-slide-indicator .indicator {
    position: absolute;
    top: 4px;
    left: 4px;
    width: var(--hf-tab-width, 86px);
    height: 36px;
    border-radius: var(--hf-tab-radius, 999px);
    background: var(--hf-tab-fill, #18181b);
    transform: translateX(var(--hf-tab-offset));
    box-shadow: 0 12px 26px rgba(0, 0, 0, 0.18);
  }
  .hf-transition-tabs-slide-indicator button {
    --hf-tab-highlight-start: clamp(
      0px,
      calc(var(--hf-tab-offset) - var(--hf-tab-index) * var(--hf-tab-width, 86px)),
      var(--hf-tab-width, 86px)
    );
    --hf-tab-highlight-end: clamp(
      0px,
      calc(
        var(--hf-tab-offset) + var(--hf-tab-width, 86px) - var(--hf-tab-index) *
          var(--hf-tab-width, 86px)
      ),
      var(--hf-tab-width, 86px)
    );
    position: relative;
    z-index: 1;
    height: 36px;
    border: 0;
    background-color: transparent;
    background-image: linear-gradient(
      to right,
      #6f6f78 0 var(--hf-tab-highlight-start),
      #fff var(--hf-tab-highlight-start) var(--hf-tab-highlight-end),
      #6f6f78 var(--hf-tab-highlight-end) 100%
    );
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    font-weight: 850;
  }
</style>

<script>
  (function () {
    "use strict";

    var vars =
      window.__hyperframes && window.__hyperframes.getVariables
        ? window.__hyperframes.getVariables()
        : {};

    // Unrecognised overrides return to their declared defaults.
    // The pill is the one accent-carrying element here, so the three chromatic
    // options ride the composition's own tokens and fall back to ink.
    var accents = {
      ink: "#18181b",
      green: "var(--brand, #18181b)",
      blue: "var(--accent, #18181b)",
      violet: "var(--accent-2, #18181b)",
    };
    var widths = { compact: 72, standard: 86, wide: 104 };
    var shapes = { pill: "999px", rounded: "12px", square: "4px" };

    function pick(table, value, fallback) {
      return Object.prototype.hasOwnProperty.call(table, value) ? value : fallback;
    }

    var accent = accents[pick(accents, vars.accent, "ink")];
    var width = widths[pick(widths, vars.width, "standard")];
    var radius = shapes[pick(shapes, vars.shape, "pill")];
    var labels =
      typeof vars.labels === "string"
        ? vars.labels.split(",").map(function (part) {
            return part.trim();
          })
        : [];
    labels = labels.filter(function (part) {
      return part.length > 0;
    });

    var roots = document.querySelectorAll(".hf-transition-tabs-slide-indicator");
    for (var i = 0; i < roots.length; i += 1) {
      roots[i].style.setProperty("--hf-tab-fill", accent);
      roots[i].style.setProperty("--hf-tab-width", width + "px");
      // The timeline slides the pill by one standard tab, so scale that slide
      // to whatever a tab is actually worth here.
      roots[i].style.setProperty("--hf-tab-step", String(width / 86));
      roots[i].style.setProperty("--hf-tab-radius", radius);
      // A single tab has nowhere to slide to, so it is left as authored.
      if (labels.length > 1) {
        var old = roots[i].querySelectorAll("button");
        for (var j = 0; j < old.length; j += 1) {
          old[j].parentNode.removeChild(old[j]);
        }
        for (var k = 0; k < labels.length; k += 1) {
          var button = document.createElement("button");
          button.textContent = labels[k];
          button.style.setProperty("--hf-tab-index", String(k));
          roots[i].appendChild(button);
        }
        roots[i].style.setProperty("--hf-tab-count", String(labels.length));
      }
    }
  })();
</script>

<!--
  Timeline integration:
  tl.fromTo('.hf-transition-tabs-slide-indicator', { '--hf-tab-x': '0px' }, { '--hf-tab-x': '86px', duration: 0.42, ease: 'power3.inOut' }, startTime);
-->
```

</VariablesExplorer>

## Install

<InstallCommand command="npx hyperframes add tabs-slide-indicator" item="tabs-slide-indicator" />

That writes one file: `compositions/components/tabs-slide-indicator.html`.

## Variables

Every one of these has a default, so the piece works untouched. Set the ones you
want to change on the element:

| Variable | Default | Accepts | What it does |
| --- | --- | --- | --- |
| `accent` | `ink` | `ink`, `green`, `blue`, `violet` | Fill of the sliding pill. ink is literal; the rest ride the composition theme tokens. |
| `width` | `standard` | `compact`, `standard`, `wide` | Width of one tab. The slide the timeline drives is scaled to match, so the pill still lands on the next tab. |
| `shape` | `pill` | `pill`, `rounded`, `square` | Corner radius of the track and the pill. |
| `labels` | `Plan,Debug,Ask` | string | The tab names, separated by commas. Two or more names rebuild the row. |

Set them with `data-variable-values` on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:

```html wrap
<div
  data-composition-id="tabs-slide-indicator"
  data-composition-src="compositions/components/tabs-slide-indicator.html"
  data-variable-values='{"accent":"ink","width":"standard","shape":"pill","labels":"Plan,Debug,Ask"}'
></div>
```

## Source

<Accordion title={`tabs-slide-indicator.html`}>

```html
<!--
  Tabs Slide Indicator - transitions.dev-inspired primitive for HyperFrames.

  Paste the markup, CSS and script into a composition. Use the timeline
  integration note at the bottom as the starting point for deterministic GSAP
  animation.

  Variables. The script reads each one, falls back to the declared default on
  anything missing or unrecognised, and writes the result as a custom property
  the CSS below consumes. The timeline recipe at the bottom is untouched by
  them: it keeps sliding the pill one tab to the right, and these decide how
  wide that tab is, what the pill looks like and what the tabs say.

    - accent (ink | green | blue | violet, default ink): fill of the sliding
      pill. ink is a literal near-black; the other three ride the composition's
      own brand, accent and accent-2 tokens and fall back to that same ink when
      the composition declares none. The labels sitting on it stay white, so all
      four keep the active tab readable.
    - width (compact | standard | wide, default standard): width of one tab,
      72px, 86px or 104px. The slide the timeline drives is scaled by the same
      ratio, so the pill still lands exactly on the next tab rather than
      stopping short or overshooting it.
    - shape (pill | rounded | square, default pill): corner radius of the track
      and the pill, 999px, 12px or 4px.
    - labels (text, default "Plan,Debug,Ask"): the tab names, separated by
      commas. Two or more names rebuild the row, one name or none leaves the
      authored markup alone, since a single tab has nowhere to slide to.

  With the defaults, this renders three 86px tabs in a light pill track. The
  near-black pill and white active label move from the first tab to the second.
-->

<div
  class="hf-transition-tabs-slide-indicator"
  data-composition-variables='[
    { "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Fill of the sliding pill. ink is literal; the rest ride the composition theme tokens.", "default": "ink", "options": [{ "value": "ink", "label": "Ink" }, { "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
    { "id": "width", "type": "enum", "role": "layout", "label": "Tab width", "description": "Width of one tab. The slide the timeline drives is scaled to match, so the pill still lands on the next tab.", "default": "standard", "options": [{ "value": "compact", "label": "Compact" }, { "value": "standard", "label": "Standard" }, { "value": "wide", "label": "Wide" }] },
    { "id": "shape", "type": "enum", "role": "style", "label": "Shape", "description": "Corner radius of the track and the pill.", "default": "pill", "options": [{ "value": "pill", "label": "Pill" }, { "value": "rounded", "label": "Rounded" }, { "value": "square", "label": "Square" }] },
    { "id": "labels", "type": "string", "role": "content", "label": "Labels", "description": "The tab names, separated by commas. Two or more names rebuild the row.", "default": "Plan,Debug,Ask" }
  ]'
>
  <span class="indicator"></span><button style="--hf-tab-index: 0">Plan</button
  ><button style="--hf-tab-index: 1">Debug</button><button style="--hf-tab-index: 2">Ask</button>
</div>

<style>
  .hf-transition-tabs-slide-indicator {
    --hf-tab-x: 0px;
    --hf-tab-offset: calc(var(--hf-tab-x) * var(--hf-tab-step, 1));
    position: relative;
    display: inline-grid;
    grid-template-columns: repeat(var(--hf-tab-count, 3), var(--hf-tab-width, 86px));
    padding: 4px;
    border: 1px solid #e4e4e7;
    border-radius: var(--hf-tab-radius, 999px);
    background: #f4f4f5;
    font-family: Inter, system-ui, sans-serif;
  }
  .hf-transition-tabs-slide-indicator .indicator {
    position: absolute;
    top: 4px;
    left: 4px;
    width: var(--hf-tab-width, 86px);
    height: 36px;
    border-radius: var(--hf-tab-radius, 999px);
    background: var(--hf-tab-fill, #18181b);
    transform: translateX(var(--hf-tab-offset));
    box-shadow: 0 12px 26px rgba(0, 0, 0, 0.18);
  }
  .hf-transition-tabs-slide-indicator button {
    --hf-tab-highlight-start: clamp(
      0px,
      calc(var(--hf-tab-offset) - var(--hf-tab-index) * var(--hf-tab-width, 86px)),
      var(--hf-tab-width, 86px)
    );
    --hf-tab-highlight-end: clamp(
      0px,
      calc(
        var(--hf-tab-offset) + var(--hf-tab-width, 86px) - var(--hf-tab-index) *
          var(--hf-tab-width, 86px)
      ),
      var(--hf-tab-width, 86px)
    );
    position: relative;
    z-index: 1;
    height: 36px;
    border: 0;
    background-color: transparent;
    background-image: linear-gradient(
      to right,
      #6f6f78 0 var(--hf-tab-highlight-start),
      #fff var(--hf-tab-highlight-start) var(--hf-tab-highlight-end),
      #6f6f78 var(--hf-tab-highlight-end) 100%
    );
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    font-weight: 850;
  }
</style>

<script>
  (function () {
    "use strict";

    var vars =
      window.__hyperframes && window.__hyperframes.getVariables
        ? window.__hyperframes.getVariables()
        : {};

    // Unrecognised overrides return to their declared defaults.
    // The pill is the one accent-carrying element here, so the three chromatic
    // options ride the composition's own tokens and fall back to ink.
    var accents = {
      ink: "#18181b",
      green: "var(--brand, #18181b)",
      blue: "var(--accent, #18181b)",
      violet: "var(--accent-2, #18181b)",
    };
    var widths = { compact: 72, standard: 86, wide: 104 };
    var shapes = { pill: "999px", rounded: "12px", square: "4px" };

    function pick(table, value, fallback) {
      return Object.prototype.hasOwnProperty.call(table, value) ? value : fallback;
    }

    var accent = accents[pick(accents, vars.accent, "ink")];
    var width = widths[pick(widths, vars.width, "standard")];
    var radius = shapes[pick(shapes, vars.shape, "pill")];
    var labels =
      typeof vars.labels === "string"
        ? vars.labels.split(",").map(function (part) {
            return part.trim();
          })
        : [];
    labels = labels.filter(function (part) {
      return part.length > 0;
    });

    var roots = document.querySelectorAll(".hf-transition-tabs-slide-indicator");
    for (var i = 0; i < roots.length; i += 1) {
      roots[i].style.setProperty("--hf-tab-fill", accent);
      roots[i].style.setProperty("--hf-tab-width", width + "px");
      // The timeline slides the pill by one standard tab, so scale that slide
      // to whatever a tab is actually worth here.
      roots[i].style.setProperty("--hf-tab-step", String(width / 86));
      roots[i].style.setProperty("--hf-tab-radius", radius);
      // A single tab has nowhere to slide to, so it is left as authored.
      if (labels.length > 1) {
        var old = roots[i].querySelectorAll("button");
        for (var j = 0; j < old.length; j += 1) {
          old[j].parentNode.removeChild(old[j]);
        }
        for (var k = 0; k < labels.length; k += 1) {
          var button = document.createElement("button");
          button.textContent = labels[k];
          button.style.setProperty("--hf-tab-index", String(k));
          roots[i].appendChild(button);
        }
        roots[i].style.setProperty("--hf-tab-count", String(labels.length));
      }
    }
  })();
</script>

<!--
  Timeline integration:
  tl.fromTo('.hf-transition-tabs-slide-indicator', { '--hf-tab-x': '0px' }, { '--hf-tab-x': '86px', duration: 0.42, ease: 'power3.inOut' }, startTime);
-->
```

</Accordion>

## Usage

Open `compositions/components/tabs-slide-indicator.html` and paste its contents into your composition. See the comment header in the file for detailed instructions.

{/* hf:generated-footer */}

Tagged `transition-primitive` `transitions-dev-port` `tabs` `indicator`.

## Related topics

- [Browse the complete Catalog](/catalog)
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
- [Build a richer composition](/go-further)
