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Showing content from https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_logical_properties_and_values below:

CSS logical properties and values - CSS: Cascading Style Sheets

The CSS logical properties and values module defines logical properties and values that can control layout through logical rather than physical direction and dimension mappings. Logical properties define direction‐relative equivalents to their corresponding physical properties.

The start of a line is not always the left side of a line. Different writing systems operate in various directions. For example:

• English and Portuguese are written from left to right with new lines added below the previous ones.
• Hebrew and Arabic are right-to-left languages with new lines again being added below the previous ones.
• In some writing modes, the text lines are vertical, written from top to bottom. Chinese, Vietnamese, Korean, and Japanese are traditionally written vertically, from top to bottom, with each new vertical line added to the left of the previous one.
• Traditional Mongolian is also a top-to-bottom language, but new lines are to the right of previous ones.

The logical properties defined in this module enable defining properties relative to the content's writing direction, rather than a physical direction. This means content translated into languages with different writing modes will be rendered as intended.

Logical properties and values use the abstract terms block and inline to describe the direction in which they flow. The physical meaning of these terms depends on the writing mode.

The block dimension is perpendicular to the flow of text within a line, i.e., the vertical dimension in horizontal writing modes, and the horizontal dimension in vertical writing modes. For standard English text, it is the vertical dimension.

The inline dimension is parallel to the flow of text within a line, i.e., the horizontal dimension in horizontal writing modes, and the vertical dimension in vertical writing modes. For standard English text, it is the horizontal dimension.

CSS was initially designed with only physical coordinates. The logical properties and values module defines flow–relative equivalents for many values and properties. Properties that once only accepted physical values (top, bottom, left, right) now also accept flow-relative logical values (block-start, block-end, inline-start, inline-end).

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