Host any custom application on Domino Server.
Open the application in browser. Design application such that there are features to perform search for any string in the application on browser using some button.
Enter any text/string that is available in application. After the button is clicked, all matching entries will appear.
While traversing through matching entries, the color of search string is highlighted in green.
Checking "View page source" for the opened URL suggest that font color is mentioned as "green" for the search string. So, this seems to be specification.
The URL in that case becomes similar to -->
Here some keyword (string/text) is the value that we are trying to search.
Feature is need to control/change the color from "green" to some other values.