gistfile1.css

tab-text-color: #000000;

tab-background {
  slice: sheet.png 0 0 16 16;
}

tab-close-icon {
  slice: sheet.png 16 0 16 16;
}

tab {
  layer {
    image: tab-background;
    repeat: x;
  }
  layer {
    x: left;
    y: middle;
    color: tab-text-color;
  }
  /* show close icon only if there is enough space */
  layer (tab.width > tab-close-icon.width) {
    id: close-icon;        /* ID to ask for hit-testing */ 
    image: tab-close-icon:
    x: right;
    y: middle;
    margin-right: 8;
  }
}