<s>
Mariner	B-Application
was	O
a	O
canceled	O
project	O
to	O
add	O
performance	O
and	O
stability	O
enhancements	O
to	O
the	O
browser	B-Protocol
engine	I-Protocol
used	O
in	O
the	O
Netscape	B-Protocol
Communicator	I-Protocol
web	B-Application
browser	I-Application
.	O
</s>
<s>
Mariner	B-Application
became	O
open	B-License
source	I-License
in	O
March	O
1998	O
when	O
Netscape	O
released	O
its	O
client	O
code	O
and	O
started	O
the	O
Mozilla	B-Operating_System
project	I-Operating_System
.	O
</s>
<s>
Mariner	B-Application
added	O
support	O
for	O
page	O
reflow	O
,	O
a	O
feature	O
lacking	O
in	O
previous	O
Netscape	O
releases	O
,	O
making	O
the	O
layout	O
of	O
text	O
and	O
tables	O
much	O
faster	O
.	O
</s>
<s>
In	O
addition	O
,	O
development	O
work	O
was	O
done	O
on	O
a	O
Document	B-General_Concept
Object	I-General_Concept
Model	I-General_Concept
(	O
level	O
1	O
)	O
and	O
stability	O
was	O
improved	O
.	O
</s>
<s>
Enhancements	O
to	O
HTML	B-Language
and	O
CSS	B-Language
were	O
also	O
made	O
but	O
these	O
were	O
not	O
technically	O
part	O
of	O
the	O
Mariner	B-Application
project	O
.	O
</s>
<s>
The	O
original	O
intention	O
was	O
to	O
ship	O
Mariner	B-Application
in	O
Netscape	B-Protocol
Communicator	I-Protocol
5.0	O
,	O
with	O
subsequent	O
releases	O
using	O
the	O
newer	O
NGLayout	B-Language
engine	O
(	O
now	O
called	O
Gecko	B-Language
)	O
.	O
</s>
<s>
However	O
,	O
in	O
October	O
1998	O
,	O
Netscape	O
decided	O
to	O
abandon	O
the	O
old	O
layout	B-Protocol
engine	I-Protocol
in	O
favour	O
of	O
NGLayout	B-Language
and	O
work	O
on	O
Mariner	B-Application
ceased	O
.	O
</s>
<s>
Netscape	B-Protocol
Communicator	I-Protocol
5.0	O
and	O
Mariner	B-Application
never	O
shipped	O
.	O
</s>
<s>
The	O
next	O
major	O
Netscape	O
revision	O
(	O
Netscape	B-Protocol
6	I-Protocol
,	O
released	O
in	O
November	O
2000	O
)	O
was	O
built	O
around	O
Gecko	B-Language
.	O
</s>
