- From: Ian Jacobs <ij@w3.org>
- Date: Thu, 15 Jun 2000 15:41:26 -0400
- To: w3c-wai-ua@w3.org
15 June 2000 UA Guidelines Teleconference
Present:
Ian Jacobs (Chair/Scribe)
Harvey Bingham
Gregory Rosmaita
Eric Hansen
Tim Lacy
Dick Brown
Regrets:
Jon Gunderson
Denis Anson
Charles McCathieNevile
David Poehlman
Kitch Barnicle
Agenda [1]
[1] http://lists.w3.org/Archives/Public/w3c-wai-ua/2000AprJun/0475.html
Agenda:
1) Comments on new working draft? In particular?
IJ: Did anyone review the document?
EH, GR: Only briefly.
a) Definition of user agent ok?
DB: "Software" is ok.
No other objections.
b) Issue 287: 3.3, 3.5, 3.6 change "turn on/off" to "freeze"
http://cmos-eng.rehab.uiuc.edu/ua-issues/issues-linear.html#287
IJ: We can delete these since it's already a P1 requirement
in 4.6 to pause. Note that "animations" is more specific
in 3.5, 3.6
EH: Should 3.10 be expanded?
IJ: We have 4.16 to configure the number of open viewports.
We would need to incorporate the blinking / text info
into 4.16.
Action IJ: Propose a new 4.6 with deleted 3.3, 3.5, 3.6.
c) Definitions ok? (Synchronization, Control/Configure)
EH: The only comment is that in the example (sync of audio
presentation with captions); maybe need another example.
Resolved: Make 4.16 "configure and control" number of open windows.
2) Proposals
a) Issue 286: Harmonize volume checkpoints (3.2, 3.4, 4.8, 4.10). We
could even delete 3.2 and 3.4 since they are special cases of 4.8
(as long as minimal requirement of 4.8 includes "silent").
http://cmos-eng.rehab.uiuc.edu/ua-issues/issues-linear.html#286
IJ: Don't know how to define "background audio".
GR: "Background audio" plays on document load. You don't have
the same level of control for "background" audio as you do
for other audio (e.g., that you would select to play). I can't
stop or pause "background audio".
IJ: That sounds like an implementation detail; user agents should
allow turn on / off of all audio...whether it starts
automatically on load or not.
TL: If you're going to define that each audio channel should
be configurable from 0 to some max.
IJ: Do we have implementation experience for this?
TL: In IE, you can turn off sounds. That would be independent of
a UA speaking the page. They go through different code paths.
GR: If I turn off sounds through the options, I turn of bg sounds
and can't play sounds on demand.
TL: I'm not sure. If you right-click on a sound object, that
may force it to play. Usually, whatever drives your speakers
is some level of mixer (that controls volume according to
media type).
IJ: What about on a per-object basis?
TL: You'd have to be predictive of what the author intended.
I want to avoid heuristics. How do we identify the different
sound objects? Perhaps a menu that says "whatever this is, play
this at volume x"? But this will still be independent of any
external user agent that is speaking. If you use the
Windows media player as a standalone
(video and sound) player, whenever it plays a clip, you
have a volume control. I think the same when used as a plug-in.
IJ: What about very short sounds?
TL: You have background sounds, system sounds, and other families
of sound components that could be activated from within a Web
page.
GR: And you have buffering, cue before/after, etc.
GR: I don't want turning off audio (to suppress background audio)
to suppress cue-before/cue-after sounds.
HB: One related aspect is the need to synchronize this material.
That synchronization can be a function of how fast the audio
is displayed.
IJ: Is background audio a particular track of a degenerate
multimedia presentation (with static visual)?
EH: If bg is related to "on load", we should say that in plain
language.
GR: Historically, background sounds are distinct from multimedia
presentation audio tracks.
HB: Some multimedia has a fixed frame rate.
GR: A multimedia "event" is something that is initiated by
the user.
IJ: I agree with TL that relative control of all audio
sources from 0 to some level meets all the requirements.
Global control of volume is an important special case of this.
TL: At msdn, the volume attribute and property only apply to the
"bgsound" attribute, which implies that if you have a
multimedia clip, the html volume attribute (extension)
would not be applicable. Whatever is being used to play that
would have to control the volume independently. It's also
read-only; you can't change the volume on the fly; it's set
by the author.
IJ: No "bgsound" in HTML 4.0. CSS2 aural style sheets (including
'play-during') only in the context of synthesized speech.
GR: Some pages use real audio as background sounds. This may
cause my speech synthesizer or UA to crash.
Proposed requirements:
a) Turn on off all audio
HB: Different from loading.
GR: Maybe suggest that loading be suppressed...
b) Turn on/off audio sources selectively
c) Control the volume of all audio
d) Control the volume of audio sources selectively
Action TL: Ask MS Windows media people about possibility of
independent volume control of audio sources.
Action IJ: Talk to Madeleine about this.
No resolution.
b) Checkpoint 5.8: "benefit accessibility"
http://lists.w3.org/Archives/Public/w3c-wai-ua/2000AprJun/0474.html
Resolved: Adopt this proposal
Action IJ: Incorporate change into document.
3) Issue 257: Minimal requirements:
http://cmos-eng.rehab.uiuc.edu/ua-issues/issues-linear.html#257
(Refer to http://www.w3.org/WAI/UA/2000/05/ua-minreqs)
a) Single key (10.5) from Kitch
http://lists.w3.org/Archives/Public/w3c-wai-ua/2000AprJun/0433.html
Not discussed since Kitch absent.
b) Fonts and colors (4.1, 4.2, 4.3, 4.4)
http://lists.w3.org/Archives/Public/w3c-wai-ua/2000AprJun/0432.html
IJ: I propose using system values.
TL: We talk about this a lot at MS. The consensus is that
there are so many ways people need to change colors and fonts,
we allow them total control. In IE, they pick up whatever the
system offers.
Resolved: Adopt proposed suggested requirements.
Mention CSS implementations and generic font families.
EH: I like the ability to of a temporary view of a configuration
to ensure its accessibility, without trapping the user.
IJ: Sounds like a new set of requirements. I hesitate to go there
at this point. Checkpoint 10.7 includes a requirement to be
able to return to browser default settings. It doesn't cover
"ease" of returning to defaults.
c) Audio/speech (4.8, 4.9, 4.11)
http://lists.w3.org/Archives/Public/w3c-wai-ua/2000AprJun/0447.html
HB: I think that users need to be able to arbitrarily make
speed slower or faster
EH: Add a note, in the section on minimal requirements that
there may be users who wish to have a greater range
(e.g,. greater than 500 words/minute).
Action GR: Find out min/max rates of three available synthesizers.
Resolved:
a) Delete "and other articulation characteristics" from 4.11
b) Refer to the list of CSS2 voice characteristic properties
and quote the property names.
HB: Speech rate is a good surrogate for gender.
IJ: CSS doesn't specify a range for voice families.
GR: Frequently, there are about 6 different voices used
for orientation.
c) Minreqs is the list of discrete values of those properties.
NOT COVERED IN THE MEETING
e) Checkpoint 7.5: Proposed search minreq: case-sensitive forward.
d) Checkpoints 6.1, 8.1, 2.7, 8.2, and 8.3
http://lists.w3.org/Archives/Public/w3c-wai-ua/2000AprJun/0448.html
f) Others
a) "Easy access": 10.8, 2.3
b) Checkpoint 10.4: Input configuration
c) Checkpoints 4.13 and 4.14: selection and focus highlight
d) Checkpoint 9.3: Configuration of notification.
Continued Action items:
1) IJ: Draft a preliminary executive summary/mini-FAQ for developers.
(No deadline.)
2) CMN: Propose a technique that explains how serialization plus
navigation would suffice for Checkpoint 8.1.
3) GR: Look into which checkpoints would benefit from audio examples
in the techniques document.
Completed Action items:
1) KB: Propose a minimum or preferred set of functions that should be
available to single command configuration
Done:
http://lists.w3.org/Archives/Public/w3c-wai-ua/2000AprJun/0433.html
2) JG: Send proposal to Judy proposal for WG ftf meeting
end September. Look for a host involved with multimedia or mobile.
--
Ian Jacobs (jacobs@w3.org) http://www.w3.org/People/Jacobs
Tel: +1 831 457-2842
Cell: +1 917 450-8783
Received on Thursday, 15 June 2000 15:41:30 UTC