direction

It is documented as part of the CSS Writing Modes specification.

Syntax

/* Usage Example */
.arabic-text {
  /* Sets text to flow from right to left */
  direction: rtl;
}

/* Syntax */
direction: ltr;
direction: rtl;

/* Global values */
direction: inherit;
direction: initial;
direction: revert;
direction: revert-layer;
direction: unset;