The World Wide Web (WWW) covers the globe. However, the browsing functions for documents in multiple languages are not easily accessed by occasional users. Functions to display and input multilingual texts in digital libraries are clearly crucial. Multilingual HTML (MHTML) is a document browser technology for multilingual documents on the WWW. The authors developed a display function for multilingual documents based on MHTML technology and extended it to text inputs in multiple languages for off-the-shelf browsers and sample applications. This extension creates an environment for digital library end-users, wherein they can view and search multilingual documents using any off-the-shelf browser. This paper also discusses the lessons learned from the MHTML project.