On a mailing list, I once read a comment to the effect that DITA was not suitable for Help, as it didn't provide support for popups. This comment rang a bell with me. When Microsoft released HTML Help (in 1995, I think), one of the first criticisms was that it didn't support rich text popups like good old WinHelp did. True, it did not, and its support for plain text popups was ungainly. Over time, the popup problem was solved by DHTML.

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