Try browsing
doc:///doc/api/browser.InputTagRef.html
It does not display at all well.
Viewing the source indicates that it contains this text about where
it chokes:

    An instance of class InputTagRef is created for each occurrence of
    a <input> tag in an html form. It serves as the definition of an
    html INPUT item as it appears in an html document. This is the
    subclass of all <input> items which handles general book keeping,
    and default initialization, the creation of the FormItem which
    will handle the specifics of the type of form item this is.

Discussion of HTML tags in html text must be properly escaped, else
the <input> tags are interpreted, not printed. This is not what you want.
(P.S. I have no clue what <input> is supposed to do.)