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\begin{document}
Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w}\`{o}\DIFadd{rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w}\'{o}\DIFadd{rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\^orld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\"orld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\H{o}rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w}\~{o}\DIFadd{rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\c{o}rld}\DIFaddend !

\DIFdelbegin \DIFdel{Hello world}\DIFdelend %DIF > Hello w\k{o}rld!
\DIFaddbegin 

\DIFadd{Hello wor}{\DIFadd{\l}}\DIFadd{d}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w}\={o}\DIFadd{rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\b{o}rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w}\.{o}\DIFadd{rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\d{o}rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\r{o}rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\u{o}rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\v{o}rld}\DIFaddend !

Hello \DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \DIFadd{w\t{or}ld}\DIFaddend !

Hello\DIFdelbegin \DIFdel{world}\DIFdelend \DIFaddbegin \_world\DIFaddend !

and some real superscript, e.g. a degree sign:
\DIFdelbegin \DIFdel{$^\circ$.
 }\DIFdelend \DIFaddbegin 

\DIFadd{Water: H$_2$O
 }\DIFaddend\end{document}

