[whatwg] Progressive rendering

Henri Sivonen hsivonen at iki.fi
Thu Nov 9 10:57:41 PST 2006

On Nov 6, 2006, at 15:44, Alexey Feldgendler wrote:

> On Sun, 05 Nov 2006 03:32:55 +0600, Henri Sivonen <hsivonen at iki.fi>  
> wrote:
>>> It's not only about printing-while-downloading. It's about the  
>>> ability to print an arbitrarily long document without consuming  
>>> infinite memory for DOM.
>> What kind of use is this about? Is this about XHTML-Print-type  
>> stuff or about Prince-type high-end formatting? CSS already allows  
>> page number references, which means that the formatter has to  
>> paginate the whole document in order to make forward reference by  
>> page number.
>> I have never seen the source of a print-only CSS formatter, but I  
>> imagine an optimized implementation could optimize away the DOM  
>> but would still have to keep the entire CSS frame tree in memory  
>> (at least when there's generated content that depends on later  
>> page numbers).
> TeX uses repeated passes over a long document to handle cross- 
> references properly using limited memory. It would be useful if  
> HTML allowed something like that.

I see streaming bounded-memory operation and multiple passes as two  
totally different things. Making multiple passes on something stored  
on disk isn't streaming operation. It is more like an application- 
specific virtual memory. Even if it was bounded in terms of RAM, it  
isn't bounded in terms of disk.

Do you have specific real apps in mind?

Henri Sivonen
hsivonen at iki.fi

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