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Fw: Re:

From: Richard Schwerdtfeger <schwer@us.ibm.com>
Date: Mon, 23 Sep 2013 08:42:13 -0500
To: "Paul Cotton" <Paul.Cotton@microsoft.com>, janina@rednote.net, faulkner.steve@gmail.com
Cc: public-html-a11y@w3.org, jbrewer@w3.org, dbolter@mozilla.com, franko@microsoft.com, "James Craig" <jcraig@apple.com>, "Rik Cabanier" <cabanier@gmail.com>, "Dominic Mazzoni" <dmazzoni@chromium.org>
Message-ID: <OFD74C1FEA.51F20DF7-ON86257BEF.004AEA52-86257BEF.004B47C8@us.ibm.com>

Paul, Janina,

I was correct in stating that drawCustomFocusRing() was implemented in
Chrome for both Windows and Mac. So, we have one implementation of BOTH
drawSystemFocusRing and drawCustomFocusRing().

As Rik stated, the Path object does not have a full implementation and the
for Canvas 2 is to introduce a Shape object to support magnifier location


Rich Schwerdtfeger
----- Forwarded by Richard Schwerdtfeger/Austin/IBM on 09/23/2013 08:38 AM

From:	Dominic Mazzoni <dmazzoni@chromium.org>
To:	Richard Schwerdtfeger/Austin/IBM@IBMUS,
Cc:	Rik Cabanier <cabanier@gmail.com>
Date:	09/23/2013 01:11 AM
Subject:	Re:
Sent by:	dmazzoni@google.com

On Fri, Sep 20, 2013 at 4:28 PM, Richard Schwerdtfeger <schwer@us.ibm.com>
  Hey Dominic,

  When we talked you said you had implemented both drawSystemFocusRing and
  drawCustomFocusRing. I only tested with drawSystemFocusRing.

That's correct, they're both implemented.
  Rik thought there was some problems with the custom focus ring function.

  Is that still the case and if so what is the concern. Other than driving
  the magnifer I would think this basically involved calling stroke().

I'm going by the spec from here:
http://www.w3.org/TR/2dcontext/#dom-context-2d-drawcustomfocusring - let me
know if that isn't the correct document. Here's what it says for step three
of drawCustomFocusRing.

3. If the user has requested the use of particular focus rings (e.g.
high-contrast focus rings), then draw a focus ring of the appropriate style
along the intended path, and set result to false.

As best as I can determine, no operating system exposes such a preference
for high-contrast focus rings. Assistive technology like ZoomText or MAGic
just draw their own additional focus rings, they don't tell applications to
draw high-contrast focus rings. While in theory it's possible for a browser
to add that as a user preference, there are no plans to do so at this time.
Because of all this, it seems like this part of the spec isn't currently
useful and should be removed.

So, given that such a preference never exists, Chrome never draws anything
when you call drawCustomFocusRing. It just updates assistive technology and
returns false every time.

It's still useful - but the name no longer makes sense. Something like
notifyFocusRingPath might make more sense.

I don't understand why we would ever call stroke() - can you explain how
that's implied by the spec?

- Dominic
Received on Monday, 23 September 2013 13:44:00 UTC

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