The chairs asked, primarily, that the baseline proposal be separated
from the 131 decision.
Exactly: this specifies that baseline value of the TextMetrics object
corresponds to the vertical anchor point as previously defined in the
document.
The Chairs seemed confused as to what "baseline" would be used. This
document explicitly states that the baseline
corresponds to the vertical position of the anchor point as calculated
by the textBaseline algorithm, step 6, section 12.
http://lists.w3.org/Archives/Public/public-html-a11y/2011Dec/att-0061/canvasissue131textbaseline.html#dom-context-2d-textbaseline
"Let the anchor point be a point on the inline box, determined by the
textAlign and textBaseline values, as follows:
.... let the anchor point's vertical position be..."
This proposal simply exposes a value that's well defined and already
calculated by implementations supporting the textBaseline attribute.
It exposes the value within TextMetrics such that:
measureText().baseline === the anchor point's vertical position.
measureText().width is unaltered.
There is no need to gather the horizontal position of the anchor point,
width is sufficient.
-Charles
On 12/5/11 12:28 PM, Paul Cotton wrote:
>
> >Is this clear enough to submit to the chairs to reopen issue 131 for
> text baseline?
>
> Can you characterize the differences between this proposal and the
> proposal endorsed by the ISSUE-131 WG Decision?
>
> Exactly what new information do you plan to provide the Chairs in
> order to re-open ISSUE-131?
>
> /paulc
>
> Paul Cotton, Microsoft Canada
>
> 17 Eleanor Drive, Ottawa, Ontario K2E 6A3
>
> Tel: (425) 705-9596 Fax: (425) 936-7329
>
> *From:*Richard Schwerdtfeger [mailto:schwer@us.ibm.com]
> *Sent:* Sunday, December 04, 2011 2:26 PM
> *To:* Frank Olivier; chuck@jumis.com; faulkner.steve@gmail.com;
> dbolter@mozilla.com; david.bolter@gmail.com; Cynthia Shelly
> *Cc:* public-canvas-api@w3.org; public-html-a11y@w3.org
> *Subject:* Change proposal for reopening issue 131 to address chairs
> clarification on text baseline
>
> Frank, Cynthia, Charles, Steve, David,
>
> Is this clear enough to submit to the chairs to reopen issue 131 for
> text baseline?
>
> http://www.w3.org/html/wg/wiki/ChangeProposals/FocusRingTextBaseline
>
>
> If not, what should be added?
>
> Thanks,
> Rich
>
> Rich Schwerdtfeger
> CTO Accessibility Software Group
>