gecko-dev/dom/public/idl/html/HTMLPreElement.idl

 interface HTMLPreElement : HTMLElement {
 /* IID: { 0xa6cf90a4, 0x15b3, 0x11d2, \
  { 0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32 } } */

            attribute  long                 width;
 };