public interface HTMLString
In many contexts, such as Button.title and ListGrid.setCellFormatter(), an HTML String can be
specified, allowing you to use normal HTML tags and CSS to do formatting or styling.
However, bear in mind that if
you attempt any kind of layout or advanced styling in such an HTML string, different browsers may render the HTML
differently - use Smart GWT layout and styling features wherever possible to avoid this. See also CSSStyleName.