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canvas updates in response to chairs request for clarification on issue 131

From: Richard Schwerdtfeger <schwer@us.ibm.com>
Date: Fri, 15 Apr 2011 13:29:21 -0600
To: public-canvas-api@w3.org, public-html-a11y@w3.org, franko@microsoft.com, cyns@exchange.microsoft.com, faulkner.steve@gmail.com, david.bolter@gmail.com, chuck@jumis.com
Message-ID: <OFCC5627D2.F4D8BDEE-ON86257873.0068635D-86257873.006B0E5C@us.ibm.com>


This modification includes:

- a clarification on the text baseline returned
- modifying getCaretBlinkRate to return a WebIDL defined long value and
ensuring any return value <0 indicates that the OS platform does not
support a caret blink rate setting

Also, I want to point people to a modification to the 11239 bug report by
Charles Pritchard that points to browser source code that is in WebKit that
can be reused for text baseline computation on 4/13
http://www.w3.org/Bugs/Public/show_bug.cgi?id=11239  This way browser
vendors can go to the code and easily make a patch for the baseline
modification.

I am updating (in the next half hour) the change proposal for Issue 131
(http://www.w3.org/html/wg/wiki/ChangeProposals/CaretSelection#References)
to reference this revised change to the canvas 2D API (attached); to
include the 508 considerations for the Issue 131 change; and to reference
defect 11239.

(See attached file: HTML_Canvas_2DContext20110415.html)

Rich Schwerdtfeger
CTO Accessibility Software Group




Received on Friday, 15 April 2011 19:30:10 UTC

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