At 1.5% the market share of the
Opera Web browser, the
Safari Web browser is a vital concern for any
Web site that desires to support more than two distinct
Web layout engines.
Unfortunately, Safari is
closed-source, which means (among other things) that it's not practical to run on most
computer operating systems.
The Epiphany Web browser used to support multiple layout engines, and looks like it might some day support
Webkit, the underlying framework for the Safari Web browser. It is, however, currently using just
Mozilla's
Gecko layout engine presently, despite indicating its desire to move away from it.
Webkit was originally based on the layout engine used in
KDE's
Konqueror,
KHTML, but the two have diverged enough that testing in Konqueror using KHTML is not a fair test, as both layout engines can behave rather distinctly in different cases. There is a Webkit-plugin for KDE/Konqueror however, which is an option.
For the
GNOME desktop environment, we have the
Kazehakase Web browser which uses the
GTK+ widget toolkit, but was unstable when using Webkit in my brief testing, and the
Midori Web browser. Midori is mentioned especially in the
a member of the Webkit team's blog, and appeared stable enough for testing purposes, and thus has become the recommended GTK-based web agent for testing Webkit, at least until Epiphany gets its act together.