code: public ParagraphBuilder styledSpan(final String text, final TextStyle ts) {
  		final ParagraphElement paragraphElement = new Span(text, ts);
  		this.paragraphElements.add(paragraphElement);
  		return this;
  	}
docs: Create a styled span with a text content
  @param text the text
  @param ts the style
  @return this for fluent style