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Re: canvas text: ctx.font='inherit'

From: Simon Pieters <simonp@opera.com>
Date: Sat, 01 Aug 2009 09:52:18 +0200
To: "Boris Zbarsky" <bzbarsky@mit.edu>, "Ian Hickson" <ian@hixie.ch>
Cc: "public-html@w3.org" <public-html@w3.org>
Message-ID: <op.uxy35gf0idj3kv@simon-pieterss-macbook.local>
On Sat, 01 Aug 2009 03:13:09 +0200, Boris Zbarsky <bzbarsky@mit.edu> wrote:

> Ian Hickson wrote:
>> Firefox uses the canvas element's computed value for 'font' for _any_  
>> invalid value passed to the 'font' attribute.
> Sort of.  What Firefox does is to treat the font as having the following  
>   declarations specified:
>    font: whatever-you-passed-in;
>    line-height: normal;
> and then act as if that rule were applied to a node that is the child of  
> the <canvas> element (unless the canvas element is not in the document  
> tree, in which case the style is treated as inheriting from "font: 10px  
> sans-serif".
>> I've clarified that 'initial' and 'inherit' must be ignored. I haven't  
>> changed the spec to match either WebKit or Gecko here.
> So basically the behavior should be as Firefox now except:
> 1)  Treat inherit and initial as CSS syntax errors.
> 2)  Always use "font: 10px sans serif" as the parent's font, not
>      just when the <canvase> is outside of a DOM tree.
> Right?

...except when using a relative unit (em, ex, %) or using a relative  
keyword (smaller, larger, bolder, lighter), in which case you inherit from  
the canvas element.

I think it's weird to sometimes inherit from the canvas element and  
sometimes use 10px sans-serif. If we're going to use 10px sans-serif,  
could we make the relative units relative to 10px sans-serif instead of  
the canvas element?

<canvas dir> (or rather the canvas element's 'direction') affects canvas  
text rendering. Maybe direction should be an attribute on the 2d context  
instead for consistency with .font?

Simon Pieters
Opera Software
Received on Saturday, 1 August 2009 07:53:07 UTC

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