@Override
		public void hyperlinkUpdate(HyperlinkEvent e) {

			if (delegateListeners == null) {
				return;
			}

			if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
				if (isExternalLink(e)) {
					browseExternalLink(e);
					return;
				}
				Msg.trace(this, "Link activated: " + e.getURL());
				e = validateURL(e);
				Msg.trace(this, "Validated event: " + e.getURL());
			}

			for (HyperlinkListener listener : delegateListeners) {
				listener.hyperlinkUpdate(e);
			}
		}
A mapping of known style sheet colors to convert from the values in the style sheet to colors
defined in the system theme.
Ghidra/Framework/Help/src/main/java/help/GHelpHTMLEditorKit.java