This document discusses considerations for supporting right-to-left languages in web content. It covers HTML elements and attributes like <bdo> and dir that control text directionality. Unicode bidirectional algorithms are explained for proper rendering of mixed left-to-right and right-to-left text. CSS properties like direction and unicode-bidi that affect directionality are also mentioned. Examples show how to write text in a right-to-left language like Arabic or Hebrew in web pages and social media.