public static @NotNull StringBuilder appendStyledSpan(
    @NotNull StringBuilder buffer,
    @NotNull TextAttributes attributes,
    @Nullable String value,
    float saturationFactor
  ) {
    createHtmlSpanBlockStyledAsTextAttributes(attributes, saturationFactor)
      .addRaw(StringUtil.notNullize(value)) //NON-NLS
      .appendTo(buffer);
    return buffer;
  }
public static @NotNull StringBuilder appendStyledSpan(
    @NotNull StringBuilder buffer,
    @NotNull TextAttributes attributes,
    @Nullable String value,
    float saturationFactor
  )