Autocompletion of queries in Custom Search - Custom Searches bekommen Autocompletion.
Custom Search autocompletion is similar to what you see on Google.com—optional queries appear as you type your query in the search box. However, behind the scenes, we do a lot of things differently. We created a different algorithm that uses data from multiple sources, including queries to your search engine, as well as keywords and phrases extracted automatically from the content of websites that your search engine covers.
# googlecse