[webkit-dev] Question on font property value "inherit" in HTML Canvas

Mustafizur Rahaman mustaf.here at gmail.com
Mon May 23 21:34:13 PDT 2011


I was just thinking if anyone could provide me some help for the issue
mentioned below so that I can proceed further to resolve this. If you need
further info/clarification, please let me know, I would be glad to provide
more details.


On Fri, May 20, 2011 at 6:05 PM, Mustafizur Rahaman
<mustaf.here at gmail.com>wrote:

> Hi,
> I am analyzing the following issue
> https://bugs.webkit.org/show_bug.cgi?id=48575 (the attachment in the issue
> description contains multiple issues) & I was particularly looking into *
> http://w3c-test.org/html/tests/approved/canvas/canvas_text_font_001.htm*(Test-case passes in FF but NOT working in Safari(5.0.3)/Winlauncher setup
> [r86221])
> After going through the HTML5 Canvas spec (
> http://www.w3.org/TR/2dcontext/#dom-context-2d-font), my understanding is
> that if any of inherit/initial/default are used in the font property
> assignment statement (e.g., "20px inherit" OR "inherit 20px"), then it must
> ignore the font value assignment & continue with the previous font value
> assigned. This is in contrast to the CSS2.1 specification which allows the
> usage of "inherit" (The values initial/default are reserved for future use).
> Is this understanding correct?
> After debugging CSSParser & CSSGrammer.y I have found that:
> => for normal HTML/CSS the code flows through CSSParser::parseSheet() =>
> cssyyparse() => CSSParser::parseValue()
> => for HTML5 Canvas, the code flows through CSSParser::parseDeclaration()
> => cssyyparse() => CSSParser::parseValue()
> In the CSSParser::parseValue(), the handling is same for normal HTML/CSS
> as well as for HTML5 Canvas, i.e., it is handling the "inherit" in the same
> way.
> However, if my understanding as mentioned above is correct, the handling
> within the parser should be different (reason: CSS2.1 spec & the HTML Canvas
> 2D Context spec expects "inherit" to be handled differently).
> Can somebody help share thoughts/perspective on this...
> Thanks,
> Rahaman
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