Stack

Apply the stack patch to any block element to lay out its children as a vertical flex column with spacing between them — the general-purpose primitive for form sections, panel content, and card bodies, instead of hand-rolling display: flex; flexDirection: column; gap: .... Styles the host only; pair it with panelSection for padding or row for a nested horizontal group.

Props

Prop	Type	Default	Description
`gap`	`number`	`3`	Spacing multiplier for gap between children. Final gap = `themeSpacing(density × gap)`; at default density (1.5), `gap 3` ≈ `1.125em`.
`align`	`"flex-start" \| "center" \| "flex-end" \| "stretch" \| "baseline"`	unset	Cross-axis alignment (`alignItems`). Left unset by default (flex's own default, `stretch`).

Example

import { stack } from "@domphy/ui";

const Panel = {
  div: [{ h3: "Title" }, { p: "Body" }, { button: "Action" }],
  $: [stack({ gap: 2 })],
};

Customization

Must see the source of patch at the bottom of each patch page to understand the structure then code it still code as html native element.

There are four levels of customization, in increasing order of effort:

Patch props. Each patch exposes a small, stable set of props—typically fewer than five. Lowest friction.
Context attributes. Use dataTone, dataSize, and dataDensity on a container to shift tone, size, or density for an entire subtree without touching individual elements.
Inline override. Native-wins merge strategy: any property set directly on the element overrides the patch value.
Create a variant. Clone a similar patch and edit it. Use this only when you need a reusable custom version.

Formulas

Unit - U = fontSize / 4 - convert final values with themeSpacing(n).

Size - n = intrinsic text lines, w = wrapping level, d = density factor:

height        = (n * 6 + 2 * d * w) * U
paddingBlock  = d * w * U
paddingInline = ceil(3 / w) * d * w * U
radius        = d * w * U

Base density d = 1.5:

U	w=0	w=1	w=2	w=3
height (`n = 1`)	6	9	12	15
paddingBlock	0	1.5	3	4.5
paddingInline	3	4.5	6	4.5
radius	0	1.5	3	4.5

Tone - K = N / 2 where N is the palette length. For N = 18, K = 9.

Role	Shift	n=0
Background	parent +/- n	0
Text	bg + K	6
Border	bg + K/2	3
Hover	bg + 2K/3	4
Selected / Focus	above +/- K/3	2-4

State shift range: K/3 <= delta <= 2K/3.

stack

import type { PartialElement } from "@domphy/core";
import { themeDensity, themeSpacing } from "@domphy/theme";

type FlexAlign = "flex-start" | "center" | "flex-end" | "stretch" | "baseline";

/**
 * A vertical flex column with spacing between children. The general-purpose
 * primitive for stacking blocks — form sections, panel content, card bodies —
 * instead of hand-rolling `display: flex; flexDirection: column; gap: ...`.
 * Styles the host only; apply to any block element.
 *
 * @param props.gap - Spacing multiplier for gap between children (default 3 = 0.75em at density 1).
 * @param props.align - Cross-axis alignment (`alignItems`). Unset by default (flex default, stretch).
 * @example { div: [{ h3: "Title" }, { p: "Body" }], $: [stack()] }
 * @example { div: [...], $: [stack({ gap: 2, align: "center" })] }
 */
function stack(props: { gap?: number; align?: FlexAlign } = {}): PartialElement {
  const { gap = 3, align } = props;
  return {
    style: {
      display: "flex",
      flexDirection: "column",
      gap: (listener) => themeSpacing(themeDensity(listener) * gap),
      ...(align ? { alignItems: align } : {}),
    },
  };
}

export { stack };
export type { FlexAlign };

Stack#

Props#

Example#

Stack

Props

Example