or region in rendering Chinese characters if the typographic traditions have not resulted in major differences in what a character looks like. Han unification has been criticized. Text input On a Korean computer keyboard, text is typically entered by pressing a key for the appropriate jamo; the operating system creates each composite character on the fly. Depending on the Input method editor and keyboard layout, double consonants can be entered by holding the shift button. When all jamo making up a syllabic block have been entered, the user may initiate a conversion to hanja (or other special characters) using a keyboard shortcut or interface button; South Korean keyboards have a key for this. Subsequent semi-automated hanja conversion is supported in varying degrees by word processors. When using a keyboard with another language, most operating systems require the user to type with an original Korean keyboard layout; the most common is Dubeolsik. In other languages, such as Japanese, text can be entered on non-native keyboards with romanization. Operating systems such as Linux allow engine/hangul/hangul-keyboard='ro, resulting in a romaja keyboard; typing "seonggye" results in 성계. In this configuration, ㄲ is obtained by "gg" rather than . This allows keying "jasanGun" to obtain 자산군, instead of keying "jasangun" (which would provide 자상운). Korean typewriters Before Korean division Korean text input is related to Korean typewriters (타자기) before computers. The first Korean typewriter is unclear; according to Jang Bong Seon, Horace Grant Underwood made a Korean typewriter during the first decade of the 20th century. Lee Won Ik, living in the United States, has been credited with developing the first Korean typewriter in 1914. In 1927, Song Ki Joo invented the first Dubeolsik typewriter in Chicago; however, it no longer exists. Song's 1934 typewriter is stored in the Hangul museum as the oldest existing Korean typewriter. The invention of the typewriter led to the development of other typewriters in 1945 by Kim Joon Sung and 1950 by Kong Byung Woo. After division South Korea originally had a Nebeolsik standard, but Dubeolsik became standard in 1985. Hanja Some Korean fonts do not include hanja, and word processors do not allow a user to specify which font to use as a fallback for any hanja in a text; each hanja sequence must be manually formatted for a desired font. Pitch marks and vertical text Vertical text is supported poorly (or not at all) by HTML and