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Re: SVG Feedback on HTML5 SVG Proposal

From: Boris Zbarsky <bzbarsky@MIT.EDU>
Date: Mon, 23 Mar 2009 14:14:31 -0400
Message-ID: <49C7D187.6030900@mit.edu>
To: "Henry S. Thompson" <ht@inf.ed.ac.uk>
CC: public-html@w3.org
Henry S. Thompson wrote:
> All the browsers I'm familiar with (I haven't installed Chrome yet)
> support XML+XSLT via the xml-stylesheet processing instruction.
> 
> So they all have case-preserving tokenizers whose performance is
> acceptable for the people who serve and read XML+XSLT.

Which is, in the grand scheme of things, pretty much no one.  Also, if 
you're using client-side XSLT performance on the browser is not at the 
top of your concerns (if it were you'd be doing the transform once on 
server-side), nor is web page responsiveness (e.g. no incremental 
rendering with XSLT).

> Who then has ruled that a case-preserving tokenizer "imposes an
> unacceptable performance penalty", and on the basis of what evidence?

Last I heard, browser parser developers; they have presumably done some 
measurements.  I can tell you for a fact that using a case-preserving 
tokenizer in the HTML parser in Gecko (the current one, not the new one 
based on HTML5 that's being worked on) would be quite noticeable; there 
were measurements done on the performance impact before switching to the 
current model, where tag and attribute names are interned as early as 
possible and the difference was quite noticeable.

-Boris
Received on Monday, 23 March 2009 18:15:30 UTC

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