There have been increasing demands for the expansion of the number of modern Hangul syllables to represent old Hangul documents and foreign language pronunciations on the Web. The current Korean orthography policies regulate the representation of Hangul within a maximum of 11172 syllables. This paper attempts to implement a Web input method which is able to express 39.9 billion syllables according to the principle of Hunminjeongeum. We apply Web open font for users to easily use it in the Web environment which generates the fonts of full set syllables defined by Hunminjeongeum and provides a touch-style screen keyboard. Finally, we point out limitations of the current national standard KS X 2016 in the sense that it lacks the nature of science.