code: public ResponsiveMediaFormatsBuilder breakpoint(@NotNull String breakpoint, int width, int height) {
      mediaFormats.add(MediaFormatBuilder.create(buildCombinedName(mainMediaFormat, breakpoint, width, height))
          .label(mainMediaFormat.getLabel())
          .extensions(mainMediaFormat.getExtensions())
          .ratio(mainMediaFormat.getRatio())
          .fixedDimension(width, height)
          .property(MediaNameConstants.PROP_BREAKPOINT, breakpoint)
          .build());
      return this;
    }
docs: Defines one breakpoint for each "on-the-fly" format required.
  @param breakpoint Breakpoint name which is set in the {@link MediaNameConstants#PROP_BREAKPOINT} property.
  @param width Width for the breakpoint
  @param height Height for the breakpoint
  @return this