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A
Okay,
yeah,
I
think
the
screen
appears
now
for
you
yeah.
So
first,
let
me
briefly
introduce
myself
tom
tom
steiner.
I
work
as
a
chrome,
developer
relations
engineer
at
google
and,
together
with
my
colleague,
francoise
buffer,
we
worked
on
solving
a
problem
that
big
pages
and
small
pages
have,
but
it's
definitely
more
yeah
hard
for
big
pages
like
google.com
to
get
a
lot
of
traffic.
A
What
is
the
thing
we
want
to
solve?
So
the
thing
is:
google
now
has
a
dark
mode.
If
you
go
to
settings
at
the
bottom
of
your
google
page,
you
can
enter
search,
settings
go
to
appearance
and
say
you
want
to
have
dark
theme,
always
light
theme
always
or
device
default,
and
device
default
is
tricky
because
device
default
is
connected
to
things.
A
Like
your
system
preferences
on
your
system,
you
can
have
dark
mode,
always
light
mode
always
or-
and
this
is
the
interesting
one
here-
auto
autumn
means
whenever
you
have
your
night
shift
as
apple
calls,
it
setting
switch
to
night
mode.
Your
operating
system
would
automatically
switch
to
night
mode.
This
means
for
sites
like
google.com
that
want
to
adopt
to
these
settings.
A
They
can't
rely
on
a
cookie
just
because
they
don't
know
at
what
time
your
auto
settings
have
switched,
so
you
might
make
a
search
at
6,
00
pm,
I'm
still
in
light
mode
and
at
6
00
p.m,
and
one
minute
your
system
may
have
switched
to
dark
mode
and
of
course,
you
can
imagine
at
the
size
of
google
at
the
traffic
of
google.
We
run
into
the
trouble
that,
ideally
we
want
to
deliver
the
slightest
possible
page
experience,
but
yeah.
We
can't
really
do
that.
A
If
you
don't
know
the
preferred
color
scheme
that
you
have
which
might
be
changing,
as
I
just
said
so,
depending
on
if
the
user
has
said
auto
on
or
off
so
the
thing
is
here:
google,
as
you
know,
is
a
pretty
lean
side
and
there's
not
much
on
it,
but
eventually
there's
a
lot
of
css
that
still
needs
to
be
loaded
and
loaded
in
a
way
that
is
dependent
on
dark
mode
or
a
light
mode.
A
So
if
you
just
imagine
other
different
ways
that
google
can
surface
results,
its
images,
its
maps,
its
shopping
results,
it's
just
regular
results.
It's
all
the
kind
of
one
boxes.
So
if
you
have
something
like
a
sports
one
box,
that
shows
you
the
results
of
an
ongoing
game
and
so
on,
there's
a
lot
of
css
that
will
be
needed
and
it
will
be
needed
in
a
way
that
is
either
dark
mode
or
light
mode.
A
So
what
we
did
is
we
and
I'm
glad
that
joef
was
having
this
session
before
worked
on
something
where
we
would
unearth
the
user's
preferred
color
scheme
as
early
as
possible,
and
you
all
probably
know
the
user
use
reference
media
feature
sorry,
media
feature
which
is
prefers
color
scheme,
but
this
requires
the
page
to
have
loaded
until
you
can
evaluate
either
with
javascript
or
in
css.
A
What
is
going
on
so,
ideally,
as
I
said
at
the
traffic
of
google
and
now
pages
similar
to
google,
we
want
to
have
this
before
and
so
what
we
did
is
we
came
up
with
a
way,
as
I
said,
to
unearth
your
preferences
locally,
and
I
want
to
briefly
show
you
what
we
have
here.
So
you
can
see
I'm
filtering
on
the
document.
So
when
I
load
google.com,
as
you
can
see
here,
this
is
the
url
of
google.com.
A
The
browser
sets
sorry
the
server
sent
a
header
and
it
tells
the
client
hey
by
the
way
I'm
accepting
the
client
sent
sec,
ch
reverse
color
scheme
and
actually
for
me
this
is
a
critical
client
hand,
which
means
traffic
will
be
dependent
on
the
response
that
the
client
sends
and
then
you
can
see
at
the
very
bottom.
If
I
scroll
down
with
my
client
descending
here,
it's
telling
the
google
server
that
I'm
locally
preferring
dark
mode.
A
If
I
switch
to
light
mode
now,
you
can
see
my
operating
system
changes
and
upon
the
next,
it's
blocking
a
bit
beach,
balling,
just
a
sec.
Okay,
I
think
it's
slowly
propagating
yeah.
So
let
me
try
to
reload
now.
A
Now
I
can
see
google
is
in
light
mode
and
if
I
look
at
the
same
thing
now
go
to
the
very
bottom,
you
can
see.
Sex
ch
prefers
color
scheme
right,
so
here
we
go,
and
this
means
the
page
has
optimized
automatically
for
my
now
changed
theme,
and
this
is
what
we
have
in
the
sec.
C8
prefers
color
scheme
user
preference
media
feature.
A
So
there's
a
spec
for
that.
It's
not
just
limited
to
the
previous
color
scheme
that
you
can
see
here,
but
the
idea
is
to
take
everything
that
we
have
in
the
equivalent
css
spec
and
just
simply
translate
it
over
to
client
hints.
So
you
can
see
there's
something
for
reduced
motion.
Reduced
transparency
prefers
contrast.
Forced
colors
prefers
color
scheme
that
I
just
mentioned,
and
the
first
prefers
reduced
data.
So
all
of
those
are
listed
here
currently
in
chromium.
A
We
have
implemented
preference
color
scheme
thanks
to
francois
who
did
the
implementation
and
yeah
it's
a
draft
community
report.
We
have
an
explainer
as
well.
We
ran
through
a
tag
review.
We
ran
through
mozilla
and
webkit
position
requests
and
so
on.
So
we
try
to
get
an
as
holistic
view
of
other
vendors
opinion
on
that
as
possible
and
so
far
it's
rolled
out
on
google.
It's
working
really
well,
as
as
far
as
I
can
tell
we
are
using
this
for
google.com,
so
it's
a
staged
rollout.
A
If
you
don't
see
it
yet
it
will
come
eventually.
We're
also
looking
for
youtube
to
add
support
for
this,
because
in
youtube
actually
right
now,
if
you
switch
themes
or
even
if
you
just
load
youtube
with
a
dark
theme,
what
you
can
briefly
see
is
the
lighting
actually.
Actually,
if
I
can
quickly
show
this,
you
can
see
the
light
theme
very
quickly
up
here.
So
let
me
switch
back
to
dark
and
then
load
youtube.com
yeah.
It
still
takes
a
long
time
to
propagate.
A
Here
we
go
so
if
I'm
loading
youtube
now,
you
should
see
that
in
cash
now,
but
if
a
hard
refresh
as
hard
to
see,
but
I
do
have
a
video
recording
of
disappearing.
A
So
you
can
see
that
there's
a
quick
flash
of
the
wrong
theme,
and
by
implementing
this
we
could
we
could
avoid
these
kind
of
issues
and
yeah.
That's
essentially
what
we
did
and
what
what
is
rolled
out
now,
we're
hoping
for
other
vendors
to
yeah
be
interested
in
this
because
yeah
at
the
scale
of
pages
like
google,
with
traffic
that
we
get,
it
really
does
make
a
difference.
A
And
with
that
I
guess
I
can
stop
presenting,
and
then
we
can
go
to
the
discussion
board.