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From Lisa Seacat DeLuca <>
Subject Vibration spec and Cordova integration update *** Cordova WIN ***
Date Tue, 05 Aug 2014 14:52:00 GMT

Below is an email thread from the w3c Device API's working group.  As you 
all know, we have worked to identify misalignment and make the code 
changes to align the latest w3c vibration spec with Apache Cordova 
(special thanks to Staci and Edna from the IBM team).  When performing the 
alignment we noticed a few use cases where it was unclear how the 
implementation defined in the spec should work.  Specifically whether a 
list with vibration length zero [0] should cancel the vibration or not. 
Thanks to our work in Cordova to identify this gray area, the w3c team 
added clarification to the vibration spec. 

This is just one example how it is possible for us, Apache Cordova, to 
work with the w3c teams to influence the specifications.  They listen and 
value our input!


Lisa Seacat DeLuca
Mobile Engineer | t: +415.787.4589 | | | | | | 

----- Forwarded by Lisa Seacat DeLuca/San Francisco/IBM on 08/05/2014 
10:42 AM -----

From:   Frederick Hirsch <>
To:     Lisa Seacat DeLuca/San Francisco/IBM@IBMUS
Cc:     Frederick Hirsch <>, Device APIs Working Group 
Date:   08/04/2014 12:10 PM
Subject:        Re: Vibration spec and Cordova integration update


Thanks for sharing this update to the list - this helps reaching all WG 

I’ve created a new Last Call issue for the Vibration Specification to 
track this comment:  LC-2945  ,

I propose we resolve the issue as follows:

Change section 4 (Vibration Interface) Step 9.2  [1] 

from  "If pattern is an empty list, or if the device is unable to vibrate, 
then return true and terminate these steps.“


"If pattern is an empty list, a list containing a single vibration entity 
with max duration of 0, or if the device is unable to vibrate, then return 
true and terminate these steps.“

I would categorize this change as editorial, since having a max duration 
of 0 could be interpreted as the ‘device is unable to vibrate”, however I 
think a clarification could be helpful and be incorporated as part of the 
process of creating a CR publication draft.


regards, Frederick

Frederick Hirsch, Nokia
Chair DAP

On Jul 24, 2014, at 10:13 AM, Lisa Seacat DeLuca <> 

> Since we didn't have a call this morning I wanted to send out a quick 
update on where we're at with the Apache Cordova spec alignment for 
> The IBM team has made all of the changes for test cases and code fixes 
as well as documentation for the alignment issues identified.  These 
changes should be included in the next release of Apache Cordova.  There 
were a couple issues the team ran into that I wanted to bring up on the 
>                • Windows Phone - when a vibration duration value is 
entered that is over 5000 the windows platform ignores the event.  Within 
Cordova we will document this shortcoming.  If someone has a connection 
with the windows team it would be interesting to get their take on this. 
They might not be aware.  I would expect it to at least vibrate for 5000 
and then not acknowledge anything larger if that is their intent.
>                • Vibration cancellation - The spec is very explicit 
about what should cancel a vibrate. Which is either navigator.vibrate(0) 
or navigator.vibrate([]). So what should navigator.vibrate([0]) do?  In 
Cordova land we also treat navigator.vibrate([0]) as a cancellation. 
> Would appreciate your thoughts, 
> Lisa
> Lisa Seacat DeLuca
> Mobile Engineer | t: +415.787.4589 | | | | | <Mail Attachment.png>| <Mail 

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