Thanks. The link had a blurb about "Unexpected results" which is what I'm seeing. So as it turns out, it isn't Set Selection that's the problem, but the OnObjectModify trigger? Interesting.
Thanks so much for the info. Apparently, if we want this to work in WebDirect, it's going to have to have special layouts that don't rely on OnObjectModify for keystrokes.
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Get(ActiveSelectionStart) itself does not always work as expected in WebDirect (e.g. see notes in linked description, and also this previous thread: Get (ActiveSelectionStart) Always Returns the Same Value in WebDirect). There may be other circumstances in which its output does not match that of FileMaker Pro as well. Note that the related Get(ActiveSelectionSize) function is not supported in WebDirect.