RTL (Right to Left) - MDN Web Docs Glossary: Definitions of Web-related terms 编辑

RTL (Right To Left) is a locale property indicating that text is written from right to left. For example, the he locale (for Hebrew) specifies right-to-left. Arabic (ar) is another common language written RTL.

The opposite of RTL, LTR (Left To Right) is used in other languages, including English (en, en-US, en-GB, etc.), Spanish (es), and French (fr).