Right-to-left layouts

config.direction: "rtl" mirrors the whole stage. Set it with createState({ config: { direction: "rtl" } }), with config/set, or let the page’s dir drive it with attachDirection. A layout spec and the tree derive builds from it are identical in both directions: the compiled root carries dir="rtl" and CSS does the flipping.

Layout	In RTL
master-stack	the master is on the right
columns	the first window is the rightmost column
tabs	the tab strip reads right to left
grid	each row fills from the right
spiral, bsp, tree	every horizontal split mirrors
floating	each window’s x is measured from the right edge

compile emits logical insets (inset-inline-start/-end, inset-block-*) for place, and anchor sides and gravity are logical too. window/drop zones name the screen side the pointer is on, and the layout maps them to its own mirrored zone.

In the browser

The input adapter works in screen terms, so every gesture does what it looks like: floating move, resize, snap zones, magnetism and pinch follow the pointer; drop zones and the tab-drag insertion point mirror; the left and right arrows swap on tabs and splitters; Alt+Shift+← still moves a floating window left on screen; swipes toward the inline-start edge go to the next tab or workspace.

attachDirection({ wm, element }) (also attachStage’s direction: "auto", the default) reads an explicit dir on the stage or an ancestor, or a computed direction: rtl, dispatches config/set { direction } when it differs, and watches dir changes. A page with no dir leaves the config alone. pageDirection(element) is the pure read. Cross-tab sync keeps the direction per tab.

Caveats

Window content inherits dir="rtl" from the stage root, so set dir="ltr" on content that must not flip. A floating window’s placement.x is measured from the right edge under RTL, so a saved placement does not carry across a direction change.

References: Layouts › Right-to-left and Browser adapters › Right-to-left. Try it in demo/rtl.html.