[ @sdxc/u/size ]

margin-block-start

Applies margin-block-start — the leading block edge, the top edge in a horizontal writing mode.

import { mbs } from "@sdxc/u/size";

Quick reference

Every documented call, beside the CSS it emits.

Call	CSS
`u.mbs(4)`	`css({ marginBlockStart: "calc(var(--ui-spacing, 0.25rem) * 4)" })`

Use mbs(n) to add margin to the block-start edge of an element, above it in horizontal text:

mbs(8)

<div mix={[...]}>
	<div mix={[mbs(8), ...]}>mbs(8)</div>
</div>

Every scale argument also takes a raw CSS value, which passes through untouched.

u.mbs("2.75rem")

Wrap the call in a state utility to scope it to one selector.

u.hover(u.mbs(4))

Wrap the call in a container query to scope it to one width.

u.at("md", u.mbs(4))

Every numeric step multiplies --ui-spacing, so redefining it rescales every spacing and sizing utility at once:

:root {
	--ui-spacing: 0.25rem;
}

Every call that names the step now reads the new value:

mbs(4)

u.mbs(value: SpacingValue)