W3C home > Mailing lists > Public > public-html@w3.org > August 2007

3.14.11. The canvas element

From: Ben Boyle <benjamins.boyle@gmail.com>
Date: Sun, 5 Aug 2007 19:41:59 +1000
Message-ID: <5f37426b0708050241v3fcdbcc5kdec12f30b7dad73@mail.gmail.com>
To: "HTML WG" <public-html@w3.org>

http://dev.w3.org/html5/spec/Overview.html#the-canvas

(why is the background blue rather than green?)

Kudos for good advice here: Authors should not use the canvas  element
in a document when a more suitable element is available.

When authors use the canvas element, they should also provide content
that, when presented to the user, conveys essentially the same
function or purpose as the bitmap canvas.
- Indeed. And when we sort out HOW we recommend people do this (see
other threads on alternatives/equivalents) we should update this
section with that practical advice.

The canvas must initially be fully transparent black.
1. "transparent black" ? Transparent I understand. Why black? This
would be adjustable through CSS? (If so, why not make it "transparent"
like all other elements?)
2. can we move this paragraph a bit further along so that all
paragraphs relating to width and height are grouped together?


It does seem like SVG could provide similar functionality BUT I don't
know either (canvas nor SVG) well enough to make informed comments.
I'm not sure either help me with the main use case I struggle with
today, namely accessible diagrams and charts (which I normally wind up
addressing with structured data - lists and/or tables - and images,
occasionally image maps).

So it seems OK, but I'd take this review with a grain of salt as I'm
not that familiar with canvas and not sure yet what I'll use it for.
The introduction bits read ok (the implementation I skimmed).
Received on Sunday, 5 August 2007 09:42:04 GMT

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