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Re: Touch-action to SVG elements

From: Arthur Barstow <art.barstow@nokia.com>
Date: Thu, 27 Mar 2014 07:41:27 -0400
Message-ID: <53340E67.8050506@nokia.com>
To: Jacob Rossi <Jacob.Rossi@microsoft.com>, Rick Byers <rbyers@google.com>
CC: "public-pointer-events@w3.org" <public-pointer-events@w3.org>
On 3/26/14 6:58 PM, ext Jacob Rossi wrote:
> I donít have a problem removing the sentence. As you said, I donít 
> really think it makes a difference whether the sentence exists or 
> notóthe decision to or not to expand it to other elements would be 
> made on its own merits at that point in time (not on whether the 
> previous spec allowed or disallowed it).

I did a quick investigation to try to understand why that note was added 
to the spec ...

The changeset that added the Note is from April 18 2013 [CS] (after LC#1 
and before CR#1). The change is based on a resolution made during the 
April 9 call [Mins] to address one of the comments Boris made [BZ].

I agree with the proposal to remove the sentence. However, I think it 
would be good to ask Boris to review the normative changes (i.e "Applies 
to: ...") as well as the Note.

-Thanks, AB

[CS] <https://dvcs.w3.org/hg/pointerevents/rev/1fca9785e96f>
[Mins] <http://www.w3.org/2013/04/09-pointerevents-minutes.html#item06>

> *From:*Rick Byers [mailto:rbyers@google.com]
> *Sent:* Wednesday, March 26, 2014 3:34 PM
> *To:* Jacob Rossi
> *Cc:* Arthur Barstow; Cathy.Chan@nokia.com; 
> public-pointer-events@w3.org; gnanasekar.s@samsung.com
> *Subject:* Re: Touch-action to SVG elements
> On Wed, Mar 26, 2014 at 4:15 PM, Jacob Rossi 
> <Jacob.Rossi@microsoft.com <mailto:Jacob.Rossi@microsoft.com>> wrote:
>     I agree "except" is clearer. I pushed an update to fix this and
>     the out of date note that Rick pointed out:
>     https://dvcs.w3.org/hg/pointerevents/raw-file/tip/pointerEvents.html#the-touch-action-css-property
>     "Applies to: all elements except: non-replaced inline elements,
>     table rows, row groups, table columns, and column groups"
>     "Note: The touch-action property applies only to elements that
>     support both the CSS width and height properties (see [CSS21] ).
>     This restriction is designed to facilitate user agent
>     optimizations for low-latency touch actions. For elements not
>     supported by default, such as <span> which is a non-replaced
>     inline element (see [HTML5]), authors can set the display CSS
>     property to a value, such as block, that supports width and
>     height. Future specifications could extend this API to all elements.."
> Love it! One pre-existing issue: I've always been uneasy about the 
> 'future specifications' part - that would be a breaking change with 
> potential web compat impact (eg. preventing scrolling in scenarios 
> that scrolling is possible today). I'd prefer we just remove any 
> speculation here (whether or not we could make such a change won't be 
> impacted by what we write here). I.e. just axe the last sentence. WDYT?
Received on Thursday, 27 March 2014 11:42:36 UTC

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