On Mon, 13 Feb 2012 12:00:52 +0100, Kang-Hao (Kenny) Lu
<[email protected]> wrote:
(12/02/13 18:33), Bjartur Thorlacius wrote:
On 2/13/12, Gray Zhang <[email protected]> wrote:
2. On an album page where hundreds of pictures are expected to be
shown,
it is often required that pictures currently in a user's screen
should
appear as fast as possible. Loading of a picture outside the screen
can
be
deferred to the time that the picture enters or is about to enter
the
screen, for the purpose of optimization user experience.
This seems like something interactive user agents should implement.
But it is currently not reliable to the extent that Web authors can rely
on it. The current spec for <img>[1] says
# User agents may obtain images immediately or on demand.
Is there actually an existing user agent that obtain images on demand?
Opera.
cheers
3. a global switch as a http header or an attribute on html to
switch
UAs image loading from "obtain images immediately" to "obtain on
demand"
or
vice versa.
Would this not depend equally on factors such as whether the user
agent would download the images over a metered connection?
Could you elaborate a little more on this? What is a metered connection?
One where you pay for the amount of data you use. The common global model
for data connections.
And to answer the previous question, Yes, that is one factor. It also
depends on the speed of your connection. In Madrid, and Melbourne, since
the start of this year, I regularly have actual throughput in single-digit
kb. Being able to selectively get the images I want becomes key to working
usefully...
cheers
Chaals
--
Charles 'chaals' McCathieNevile Opera Software, Standards Group
je parle français -- hablo español -- jeg kan litt norsk
http://my.opera.com/chaals Try Opera: http://www.opera.com
