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Re: FW: LC Comment - Syncbase events and Progressive Rendering

From: Jon Ferraiolo <jon.ferraiolo@adobe.com>
Date: Wed, 24 Nov 2004 06:30:18 -0800
To: Cyril Concolato <cyril.concolato@enst.fr>, Andrew Sledd <Andrew.Sledd@zoomon.com>
Cc: www-svg@w3.org
Message-id: <>

Andrew and Cyril,
My understanding aligns with Cyril's analysis. If a given timed element is 
supposed to start at time 1s, but because of network delays and progressive 
download it doesn't arrive until time 3s, then the timed element should 
begin playing with an offset of 2s from its start. This is true whether the 
start time is specified absolutely or via a syncarc/syncbase (e.g., 


At 05:43 AM 11/24/2004, Cyril Concolato wrote:

>Hi Andrew,
>Andrew Sledd a écrit :
>>Dear SVG WG,
>>The progressive rendering description and examples do not include 
>>presentation of document timing and animation impact. We request that 
>>this section be updated to include such information, especially in the 
>>case where timelineBegin="onStart".
>>See the following example
>><svg timelineBegin="onStart">
>>                 <circle stroke="white" stroke-width="30" fill="none" 
>> cx="100" cy="200" r="60">
>>                         <animate id="fadein" attributeName="stroke" 
>> attributeType="auto" from="white" to="#666" begin="0" dur="3s" fill="freeze"/>
>>                 </circle>
>>                 <rect id="Rect" x="20" y="20" width="180" height="180" 
>> fill="#fff">
>>                         <animate id="fadein2" attributeName="fill" 
>> attributeType="auto" from="#fff" to="red" begin="fadein.begin" dur="3s" 
>> fill="freeze"/>
>>                 </rect>
>>                 <circle id="Circle" stroke="white" stroke-width="20" 
>> fill="none" cx="200" cy="110" r="80">
>>                         <animate id="fadein3" attributeName="stroke" 
>> attributeType="auto" from="white" to="#666" begin="fadein2.begin" 
>> dur="3s" fill="freeze"/>
>>                 </circle>
>>What is the expected behavior in a progressive rendering situation where 
>>the UA renders on each element's startElement and endElement SAX events?
>>Our interpretation is that only the fadein animation is run as the begin 
>>event is raised and rendered before any of the other elements are 
>>resolved. So if the background was "white" each of the rect id="Rect" and 
>>the circle id="Circle" would be rendered, although they would not be seen 
>>because they are white. Their respective child animations would never be run.
>>Is this correct?
>My understanding is different. In this example, the only time container is 
>the svg element. So there is only one timeline, the one of the root svg 
>element. Therefore, all three animations should start. Moreover, they 
>should be in sync even if they don't start at the same time (in case of 
>progressive loading), because they get the time from the same timeline.
>My 2 cents,
>Cyril Concolato
Received on Wednesday, 24 November 2004 14:44:58 UTC

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