Variable Proximity `<mv-variable-proximity>`

As letras crescem ao longo dos eixos de uma fonte variável (peso, largura, qualquer eixo personalizado) quando um mouse ou uma caneta se aproxima, com um raio em em e uma atenuação linear, exponencial ou gaussiana; as posições das letras ficam em cache em repouso para que o campo nunca trema, e as fontes estáticas recorrem a um efeito de escala.

Categoria	Texto animado
Tipo	Web Component (`<mv-variable-proximity>`)
Status	estável
Keywords	safe-rewrite, variable-font, proximity, pointer, cursor, weight, typography, pressure

When to use

A heading or text line should swell in weight or width as the cursor approaches
An editorial, typography-driven page wants a subtle pointer effect using variable font axes

Avoid when

A big standalone headline or 404 needs stronger effects or must also animate on touch → use Cursor Type instead
Long body text; letters changing weight under the pointer disturb reading

Instalação

node scripts/add.mjs variable-proximity --out ./src/marvelous

Agente de IA com o servidor MCP do Marvelous UI: install_components({ slugs: ["variable-proximity"], target_dir: "<absolute path>/src/marvelous", framework: "react" }).

Arquivos copiados (dependências incluídas): tokens/tokens.css, core/base.css, core/dom.js, core/element.js, core/motion.js, core/observe.js, components/variable-proximity/variable-proximity.js, components/variable-proximity/variable-proximity.css.

Uso

Marcação de referência, para usar como ponto de partida e personalizar com atributos, data-* e variáveis CSS:

<div style="display:grid;gap:1.25rem;justify-items:center;text-align:center;padding:2rem 1rem;width:100%;min-height:300px;align-content:center;box-sizing:border-box;font-family:'Inter var','Segoe UI Variable Display',system-ui,sans-serif">
  <p style="margin:0;font-size:clamp(2.6rem,7vw,4.6rem);line-height:1;letter-spacing:-.02em">
    <mv-variable-proximity from="'wght' 300" to="'wght' 800" radius="2.4" falloff="gaussian">Move your cursor closer</mv-variable-proximity>
  </p>
  <p style="margin:0;font-size:1.35rem;color:var(--mv-fg-muted)">
    <mv-variable-proximity from="'wght' 350" to="'wght' 700" radius="4" style="--mv-variable-proximity-color:var(--mv-accent)">Living typography, driven by distance.</mv-variable-proximity>
  </p>
  <p style="margin:.5rem 0 0;font-size:.8rem;color:var(--mv-fg-subtle)">Font without variable axes? It automatically falls back to a scale effect.</p>
</div>

API

Attributes

Name	Tipo	Default	Description
`from`	font-variation-settings	`'wght' 400`	Axes at rest (e.g. "'wght' 300, 'wdth' 75"). wght → font-weight and wdth → font-stretch (also works with system variable fonts); other axes go through font-variation-settings.
`to`	font-variation-settings	`'wght' 900`	Axes under the cursor.
`radius`	number	`3`	Influence radius, in em (the element's font size), measured from the pointer to each letter's resting center.
`falloff`	linear \| exponential \| gaussian	`linear`	Falloff curve over distance: linear, exponential (sharp peak, long tail) or gaussian (soft plateau under the pointer).

CSS variables

Name	Default	Description
`--mv-variable-proximity-color`		Color that nearby letters tint toward (none by default).
`--mv-variable-proximity-scale`	`0.35`	Max scale-up in fallback mode (non-variable font).
`--mv-t`		Exposed on each letter (0 → 1) for your own styles.

Accessibility

The text is exposed once through a visually hidden copy; the split letters are aria-hidden. A decorative effect for mouse and pen, with no keyboard impact (touch leaves the text at rest). The rAF loop only runs while the pointer moves or letters settle, and is off with reduced motion. Forced colors: the tint is dropped. If the font doesn't interpolate the requested axes (static font), it automatically falls back to a scale effect.