Window controls

Every desktop window carries the same three commands in its title bar: get rid of this, get it out of my way, and make it bigger. macOS draws them as three coloured discs at the left, red then amber then green, which is where the nickname traffic lights comes from. Windows draws them as three thin glyphs at the right, minimise then maximise then close. The commands are the same; only the shape and the corner differ, and both platforms put the destructive one at the outer edge, furthest from the other two.

Placement is the whole point of naming this cluster, because it is pure muscle memory. A person who has used one platform for a decade throws the pointer at a corner without looking, and they are right often enough that the aim has stopped being a decision. That is also why the corner is worth so much: it is a target with two infinite edges, so the pointer cannot overshoot it. An application that invents a third position, or that swaps the order inside the cluster, costs its readers a beat on every window they close, and the beat never quite goes away. A web app drawing its own title bar (a desktop shell, or an installed app that takes over the title bar area) inherits this obligation: follow the host platform rather than picking the one the designer grew up with.

Close deserves more care than the other two, because it is the only one that can lose work, and it is deliberately placed where a fast hand lands. Confirm before discarding unsaved changes rather than after, and never make close the quiet neighbour of a destructive action it could be mistaken for. Minimise and zoom are cheap and reversible by comparison, which is a reasonable ordering rule in general: the reversible commands sit inboard, the one with consequences sits at the end.

The cluster is not the same thing as a close button inside the window’s content. A modal dialog has its own dismissal, and so does a drawer; those act on a surface the application drew, while window controls act on the window the operating system drew around all of it. Keeping the two apart matters when a web app fills the screen: a close glyph at the top right of a panel is not a window control, and drawing it in the platform’s caption style will have readers quitting the application when they meant to shut a sidebar.