v152 · window-drag
Custom titlebar safe zones
This page uses the actual CSS property name window-drag and reports whether the current browser accepts the standardized move/none values. Outside installed desktop app windows, it remains a safe visual and computed-style probe.
Mark only the titlebar as draggable
The dark titlebar receives window-drag: move. Buttons inside it explicitly receive window-drag: none so clicks still activate controls instead of moving the window.
code path
.titlebar { window-drag: move; }
.titlebar button { window-drag: none; }