<overflow-position>

The <overflow-position> enumerated value type defines how an alignment subject that is larger than its alignment container will overflow that container. For example, if centered items are wider than their container, the overflow may be displayed beyond the viewport's start edge, which can't be scrolled to. The <overflow-position> value defines whether the alignment mode should be overridden to ensure the content is visible (safe) or if the alignment mode must be adhered to (unsafe).

This data type is valid for the align-content, align-items, align-self, justify-items and justify-self properties as well as the place-content, place-items, and place-self shorthand properties. If omitted, the default overflow alignment is a blend of safe and unsafe.

Syntax

<overflow-position> = unsafe | safe

Values

The following keyword values are represented by the <overflow-position> grammar term:

safe

If the size of the alignment subject overflows the alignment container, the alignment subject is instead aligned as if the alignment mode were start.

unsafe

Regardless of the relative sizes of the alignment subject and alignment container, the given alignment value is honored.

Specifications

Specification
CSS Box Alignment Module Level 3
# typedef-overflow-position

See also

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https://developer.mozilla.org/en-US/docs/Web/CSS/overflow-position