int PaintLayerScrollableArea::VerticalScrollbarWidth(
    OverlayScrollbarClipBehavior overlay_scrollbar_clip_behavior) const {
  if (!HasVerticalScrollbar())
    return 0;
  if (overlay_scrollbar_clip_behavior ==
          kIgnorePlatformAndCSSOverlayScrollbarSize &&
      GetLayoutBox()->StyleRef().OverflowY() == EOverflow::kOverlay) {
    return 0;
  }
  if ((overlay_scrollbar_clip_behavior == kIgnorePlatformOverlayScrollbarSize ||
       overlay_scrollbar_clip_behavior ==
           kIgnorePlatformAndCSSOverlayScrollbarSize ||
       !VerticalScrollbar()->ShouldParticipateInHitTesting()) &&
      VerticalScrollbar()->IsOverlayScrollbar()) {
    return 0;
  }
  return VerticalScrollbar()->ScrollbarThickness();
}

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.