Language tools/Support of HTML RTL features in browsers

This is a summary of support of right-to-left (RTL) and bidirectional (BiDi) writing features in different browsers. It's not limited only to the new HTML5 features (bdi, dir="auto" etc.) - the intention is to include also the differences in implementation details of HTML4 BiDi features and DOM behavior.

A question mark (?) indicates that it is not known whether a browser supports the feature.

A number indicates the first version of a browser which supports the feature.