docs: function find_mdw_wpx(wpx) {
  	var delta = Infinity, guess = 0, _MDW = MIN_MDW;
  	for(MDW=MIN_MDW; MDW<MAX_MDW; ++MDW) {
  		guess = char2width_(px2char_(wpx))*256;
  		guess = (guess) % 1;
  		if(guess > 0.5) guess--;
  		if(Math.abs(guess) < delta) { delta = Math.abs(guess); _MDW = MDW; }
  	}
  	MDW = _MDW;
  }