Difference between http://jigsaw.w3.org/css-validator/ and http://www.css-validator.org/ css validators?

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I tried validating my css using both validators and they give different
results! http://www.css-validator.org/returns much more errors (245 in my
case) than http://jigsaw.w3.org/css-validator/ (which returned 24 errors).
What is the difference between these to? Aren't they both under w3c?

Options I used for http://jigsaw.w3.org/css-validator/:

   - Profile: CSS level 3
   - Medium: all
   - Warnings: all
   - Vendor extensions: default

I also tried changing Vendor extensions value, if I set it to Errors I get
about 100 errors, if I set it to warnings I get same amount of errors as
when default, which is 24.

Options I used for http://www.css-validator.org/:

   - Profile: CSS level 3
   - Medium: all
   - Warnings: all

Examples of errors not returned by css-validator but not by jigsaw:

   - ".kill-flicker: Property backface-visibility doesn't exist : hidden
   hidden" Line no: "5"
   - ": Unknown pseudo-element or pseudo-class ::-moz-focus-inner
   [-moz-focus-inner]" Line no: "225"

Thank you,
Martin

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<div dir=3D"ltr"><p style=3D"margin:0px 0px 1em;padding:0px;border:0px;font=
-size:14px;vertical-align:baseline;clear:both;color:rgb(0,0,0);font-family:=
Arial,&#39;Liberation Sans&#39;,&#39;DejaVu Sans&#39;,sans-serif;line-heigh=
t:17.8048000335693px;background-image:initial;background-repeat:initial">I =
tried validating my css using both validators and they give different resul=
ts!=C2=A0<a href=3D"http://www.css-validator.org/" rel=3D"nofollow" style=
=3D"margin:0px;padding:0px;border:0px;vertical-align:baseline;color:rgb(74,=
107,130);text-decoration:none;background:transparent">http://www.css-valida=
tor.org/</a>returns much more errors (245 in my case) than=C2=A0<a href=3D"=
http://jigsaw.w3.org/css-validator/" rel=3D"nofollow" style=3D"margin:0px;p=
adding:0px;border:0px;vertical-align:baseline;color:rgb(74,107,130);text-de=
coration:none;background:transparent">http://jigsaw.w3.org/css-validator/</=
a>=C2=A0(which returned 24 errors).<br>What is the difference between these=
 to? Aren&#39;t they both under w3c?</p><p style=3D"margin:0px 0px 1em;padd=
ing:0px;border:0px;font-size:14px;vertical-align:baseline;clear:both;color:=
rgb(0,0,0);font-family:Arial,&#39;Liberation Sans&#39;,&#39;DejaVu Sans&#39=
;,sans-serif;line-height:17.8048000335693px;background-image:initial;backgr=
ound-repeat:initial">Options I used for=C2=A0<a href=3D"http://jigsaw.w3.or=
g/css-validator/" rel=3D"nofollow" style=3D"margin:0px;padding:0px;border:0=
px;vertical-align:baseline;color:rgb(74,107,130);text-decoration:none;backg=
round:transparent">http://jigsaw.w3.org/css-validator/</a>:</p><ul style=3D=
"margin:0px 0px 1em 30px;padding:0px;border:0px;font-size:14px;vertical-ali=
gn:baseline;list-style-position:initial;color:rgb(0,0,0);font-family:Arial,=
&#39;Liberation Sans&#39;,&#39;DejaVu Sans&#39;,sans-serif;line-height:17.8=
048000335693px;background-image:initial;background-repeat:initial"><li styl=
e=3D"margin:0px;padding:0px;border:0px;vertical-align:baseline;background:t=
ransparent">Profile: CSS level 3</li><li style=3D"margin:0px;padding:0px;bo=
rder:0px;vertical-align:baseline;background:transparent">Medium: all</li><l=
i style=3D"margin:0px;padding:0px;border:0px;vertical-align:baseline;backgr=
ound:transparent">Warnings: all</li><li style=3D"margin:0px;padding:0px;bor=
der:0px;vertical-align:baseline;background:transparent">Vendor extensions: =
default</li></ul><p style=3D"margin:0px 0px 1em;padding:0px;border:0px;font=
-size:14px;vertical-align:baseline;clear:both;color:rgb(0,0,0);font-family:=
Arial,&#39;Liberation Sans&#39;,&#39;DejaVu Sans&#39;,sans-serif;line-heigh=
t:17.8048000335693px;background-image:initial;background-repeat:initial">I =
also tried changing Vendor extensions value, if I set it to Errors I get ab=
out 100 errors, if I set it to warnings I get same amount of errors as when=
 default, which is 24.</p><p style=3D"margin:0px 0px 1em;padding:0px;border=
:0px;font-size:14px;vertical-align:baseline;clear:both;color:rgb(0,0,0);fon=
t-family:Arial,&#39;Liberation Sans&#39;,&#39;DejaVu Sans&#39;,sans-serif;l=
ine-height:17.8048000335693px;background-image:initial;background-repeat:in=
itial">Options I used for=C2=A0<a href=3D"http://www.css-validator.org/" re=
l=3D"nofollow" style=3D"margin:0px;padding:0px;border:0px;vertical-align:ba=
seline;color:rgb(74,107,130);text-decoration:none;background:transparent">h=
ttp://www.css-validator.org/</a>:</p><ul style=3D"margin:0px 0px 1em 30px;p=
adding:0px;border:0px;font-size:14px;vertical-align:baseline;list-style-pos=
ition:initial;color:rgb(0,0,0);font-family:Arial,&#39;Liberation Sans&#39;,=
&#39;DejaVu Sans&#39;,sans-serif;line-height:17.8048000335693px;background-=
image:initial;background-repeat:initial"><li style=3D"margin:0px;padding:0p=
x;border:0px;vertical-align:baseline;background:transparent">Profile: CSS l=
evel 3</li><li style=3D"margin:0px;padding:0px;border:0px;vertical-align:ba=
seline;background:transparent">Medium: all</li><li style=3D"margin:0px;padd=
ing:0px;border:0px;vertical-align:baseline;background:transparent">Warnings=
: all</li></ul><p style=3D"margin:0px 0px 1em;padding:0px;border:0px;font-s=
ize:14px;vertical-align:baseline;clear:both;color:rgb(0,0,0);font-family:Ar=
ial,&#39;Liberation Sans&#39;,&#39;DejaVu Sans&#39;,sans-serif;line-height:=
17.8048000335693px;background-image:initial;background-repeat:initial">Exam=
ples of errors not returned by css-validator but not by jigsaw:</p><ul styl=
e=3D"margin:0px 0px 1em 30px;padding:0px;border:0px;font-size:14px;vertical=
-align:baseline;list-style-position:initial;color:rgb(0,0,0);font-family:Ar=
ial,&#39;Liberation Sans&#39;,&#39;DejaVu Sans&#39;,sans-serif;line-height:=
17.8048000335693px;background-image:initial;background-repeat:initial"><li =
style=3D"margin:0px;padding:0px;border:0px;vertical-align:baseline;backgrou=
nd:transparent">&quot;.kill-flicker: Property backface-visibility doesn&#39=
;t exist : hidden hidden&quot; Line no: &quot;5&quot;</li><li style=3D"marg=
in:0px;padding:0px;border:0px;vertical-align:baseline;background:transparen=
t">&quot;: Unknown pseudo-element or pseudo-class ::-moz-focus-inner [-moz-=
focus-inner]&quot; Line no: &quot;225&quot;</li></ul><div><font color=3D"#0=
00000" face=3D"Arial, Liberation Sans, DejaVu Sans, sans-serif"><span style=
=3D"font-size:14px;line-height:17.8048000335693px">Thank you,</span></font>=
</div><div><font color=3D"#000000" face=3D"Arial, Liberation Sans, DejaVu S=
ans, sans-serif"><span style=3D"font-size:14px;line-height:17.8048000335693=
px">Martin</span></font></div></div>

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