The scroll-margin-block-start property defines the margin of the scroll snap area at the start of the block dimension that is used for snapping this box to the snapport. The scroll snap area is determined by taking the transformed border box, finding its rectangular bounding box (axis-aligned in the scroll container's coordinate space), then adding the specified outsets.

/* <length> values */ scroll-margin-block-start: 10px; scroll-margin-block-start: 1em;  /* Global values */ scroll-margin-block-start: inherit; scroll-margin-block-start: initial; scroll-margin-block-start: revert; scroll-margin-block-start: unset; 

scroll-margin-block-start

The scroll-margin-block-start property defines the margin of the scroll snap area at the start of the block dimension that is used for snapping this box to the snapport. The scroll snap area is determined by taking the transformed border box, finding its rectangular bounding box (axis-aligned in the scroll container's coordinate space), then adding the specified outsets.

Syntax

/* <length> values */ scroll-margin-block-start: 10px; scroll-margin-block-start: 1em;  /* Global values */ scroll-margin-block-start: inherit; scroll-margin-block-start: initial; scroll-margin-block-start: revert; scroll-margin-block-start: unset; 

Values

<length>

An outset from the block start edge of the scroll container.

Formal definition

Initial value	0
Applies to	all elements
Inherited	no
Computed value	as specified
Animation type	by computed value type

Formal syntax

<length>

Specifications

Specification
CSS Scroll Snap Module Level 1 # margin-longhands-logical

See also

CSS Scroll Snap Well-Controlled Scrolling with CSS Scroll Snap