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LaTeX versus Html mode

The easiest way to put a command or text in your document that is only included in one of the two output modes it by using a \texonly or \htmlonly command. They ignore their argument, if in the wrong mode, and otherwise simply expand it: 
   We are now in \texonly{\LaTeX}\htmlonly{HTML}-mode.
In cases such as this you can simplify the notation by using the \texorhtml command, which has two arguments: 
   We are now in \texorhtml{\LaTeX}{HTML}-mode.
  Another possibility is by prefixing a line with \T or \W. \T acts like a comment in HTML-mode, and as a noop in LaTeX-mode, and for \W it is the other way round: 
   We are now in
   \T \LaTeX-mode.
   \W HTML-mode.
  The last way of achieving this effect is useful when there are large chunks of text that you want to skip in one mode--a HTML-document might skip a section with a detailed mathematical analysis, a LaTeX-document will not contain a node with lots of hyperlinks to other documents. This can be done using the iftex and ifhtml environments: 
   We are now in
   \begin{iftex}
     \LaTeX-mode.
   \end{iftex}
   \begin{ifhtml}
     HTML-mode.
   \end{ifhtml}
  Instead of the iftex environment, you can also use the tex environment. It is different from iftex only if you have used \NotSpecial in the preamble.
otfried@postech.vision.ac.kr

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