“According to a recent article at ZDNet, Netscape should be
shipping the first beta of Navigator 5.0 sometime in December 1999.
Navigator 5.0 will have a new layout engine, code-named gecko, that
has been available as part of the Mozilla open source effort.
Navigator 5.0 should have complete support for CSS1 and HTML 4.0,
in addition to support for the World Wide Web Consortium’s DOM, or
Document Object Model, and Extensible Markup Language (XML).
Additionally, support for CSS2, specifically much of the
positioning capability of this specification, is also present in
the Mozilla milestone deliveries.”
“What Navigator 5.0 won’t have, though, according to a document
accessible from an article at the mozillaZine site, is support for
certain browser-specific features such as Navigator 4.x’s LAYER
tag, and the associated document.layers collection. Instead,
Navigator 5.0 (from Mozilla source) is providing support only for
those features of Navigator 4.x that are supported in the HTML 4.0
and the W3C DOM. In other words, chances are that your Navigator
4.0 DHTML code will not work with Navigator 5.0, particularly if
you use the LAYER tag and the document.layers array.”
“It’s a given that Internet Explorer proprietary objects and
code won’t work with Navigator 5.0. But you might be surprised to
find that IE 5.0 pages, particularly those that limit the use of
DHTML to that supported in CSS1 and CSS2, are more likely to work
with Navigator 5.0 than code designed specifically for Navigator
4.0.”