panel.plugin("custom/marks", {
    writerMarks: {
        green: {
            button: {
                icon: "brush",
                label: "Vert"
            },
            commands() {
                return () => this.toggle();
            },
            name: "green",
            schema: {
                parseDOM: [{ tag: "span.green" }],
                toDOM: () => ["span", { class: "green" }, 0]
            }
        },
        pixel: {
            button: {
                icon: "grid-full",
                label: "Pixel"
            },
            commands() {
                return () => this.toggle();
            },
            name: "pixel",
            schema: {
                parseDOM: [{ tag: "span.pixel" }],
                toDOM: () => ["span", { class: "pixel" }, 0]
            }
        }
    }
});