Babel Esperanto has issues with character accents

[enkorvaks]

When using 'pdflatex' to compile a file containing Esperanto accented letters, the accents are separated from the letters in the HTML generated (using ngPDF). This occurs for both the 'hat' accent (^) and the other accent (usually obtained in latex via '\u{u}'). The accents behave differently between lower-case letters, and upper-case letters. It doesn't matter if the accent is applied using '^{c}', the babel-esperanto active character ^c, or unicode letters.

For ngPDF-generated HTML when using 'lualatex', the accents remain in place for almost all cases - the babel-esperanto active ^h does not work. All other active ^ characters retain their accent. Unicode works, and accents remain. When using ^{h} type, the accent remains.

[u-fischer]

well yes, tough. pdflatex can not really produce correct ToUnicode for such accents. There is some code in the pdfx package imho that tries to place accents behind the base char, but I don't know how well it works.

Using an unicode engine is recommended here.

The problem with the ^h should be reported to the esperanto maintainer. He should use (at least with the unicode engines) something like \declare@shorthand{esperanto}{^h}{ĥ} instead of an \llap.