W3C home > Mailing lists > Public > www-style@w3.org > March 2008

Re: [cssom-view] small update

From: Anne van Kesteren <annevk@opera.com>
Date: Sun, 09 Mar 2008 15:59:57 +0100
To: "Bjoern Hoehrmann" <derhoermi@gmx.net>
Cc: www-style@w3.org
Message-ID: <op.t7q7x7ak64w2qv@annevk-t60.oslo.opera.com>

On Fri, 07 Mar 2008 07:58:09 +0100, Bjoern Hoehrmann <derhoermi@gmx.net>  
wrote:
> * Anne van Kesteren wrote:
>>   http://dev.w3.org/csswg/cssom-view/
>
> You need a reference to DOM Level 2 Views. DOM Level 2 Views defines how
> the module interacts with the DOM .hasFeature(...) and related methods,
> but such a definition is absent from your draft. Since it is meant to
> update the older DOM module, you need to have some discussion of this.

I tried defining this now here:

   http://dev.w3.org/csswg/cssom-view/#dom-features

I hope we can get rid of it at some point though...


> The specification ought to have some kind of introduction that puts it
> into some context beyond what you say in the Abstract of the document.

Just some examples of what you can do with the functionality outlined in  
the draft and some lines of text around that? Or are you looking for  
something else? I was planning to do something like that in due course, at  
least.


> "The HTML body element is the first body HTML element child of the root
> HTML element html." might be better written as "In documents whose root
> element is the HTML element html, the HTML body element is the first
> body HTML element child of the root element, if any." The current text
> is unclear whether <svg ...><html ...><body> is a HTML body element, at
> least assuming obvious definitions of the terms.

Why? <html> would not be root.


> In section 2.1 you have a [CSS21] reference that is no link and has no
> entry in the References section. Why is the method called "query"? I'd
> think an .isX, .hasX, .canX, .supportsX, .doesX, ... name would be more
> appropriate.

Renamed to matchMedium.


> I don't quite understand the colorDepth and pixelDepth attributes.

I tried rewording the text although I should note I copied the text from  
Media Queries initially:

    http://www.w3.org/TR/css3-mediaqueries/#color


> The elementFromPoint(...) method takes two integers that specify the
> point. Could you comment on why, other than status quo, these should not
> be floats? Many of the interfaces in the document specify coordinates as
> floats. If the arguments are to be integers, perhaps a note about that
> would be useful.

Most interfaces actually take integers. (They said float but that was  
something I meant to fix, but forgot. Now it's done though.)


> For RangeView.getBoundingClientRect(...) you have:
>
>   3. Otherwise, return a union of the boxes in list, excluding boxes
>      that are empty, as a single TextRectangle object. If all boxes are
>      empty let the top attribute of the new TextRectangle object be the
>      value of the top attribute of the first border box in the list
>      returned. Do likewise for left and then let bottom be equal to top
>      and right to left.
>
> Couldn't this be written as follows:
>
>   3. Otherwise, return a (static) TextRectangle object describing the
>      smallest rectangle that includes the first item in list and all
>      non-empty rectangles in list.
>
> This would precisely define which among the many possible unions to use
> and avoids several redundant points in the original (such as that the
> items in the list describe border boxes and what to do with only empty
> rectangles). If my text is equivalent, I would rather you use the short
> version.

Thanks, used.


> Objects implementing the MouseEvent interface are required to also im-
> plement the MouseEventView interface, however there are name clashes in
> the two interfaces (specifically the screenX/Y and clientX/Y attributes)
> which needs to be explained or otherwise resolved in your draft.

Done.


> The MouseEventView has two redundant attributes x and y, there should be
> a note which one authors should use to avoid confusion and promote con-
> sistency.

I mentioned that x and y are there for historical reasons.


> Why is the TextRectangle called thusly? Wouldn't, say, ClientRectangle
> be a better name?

This is now ClientRect (and ClientRectList) per follow-up discussion.


> Editorially, I rather dislike the high amounts of redundant text you've
> included, it makes it very difficult to read the text correctly (you'll
> either ignore parts that look similar and miss differences, or you'll
> try very hard not to, which I find rather exhausting). The same goes for
> the rather elaborate text.
>
> As an example, section 6.3 would be better written like so:
>
>   If an element does not have an associated CSS layout box or if it is
>   an inline box, all the following attributes have the value zero. All
>   values are in number of CSS pixels.
>
>   clientTop
>      The computed value of the border-top-width property plus the
>      width of any scrollbar rendered between the top padding box
>      and top border box.
>
>   clientWidth
>     If element A is the root element, the width of the viewport;
>     otherwise the width of the padding box of element A (excluding the
>     width of any rendered scrollbar between the padding and border box)
>
>   ...

I tried rewording this.


> By the way, instead of referring to the width of the viewport, it might
> be wise to refer to the viewport's .innerWidth attribute if that is what
> you mean (the name clientWidth would suggest using the .outerWidth).

Viewport is now tied to the CSS definition of it. Would that be enough?


> Similarily, it would be very useful if you would use more mathematical
> notation instead of text where approprate, for example, rather than
>
>     2. If x is negative act as if it was zero.
>
>     3. If x is greater than the content width minus the content box
>        width act as if it was the content width minus the content box
>        width.
>
> define to use `min(content width - content box width, max(0, x))`. This
> saves readers from checking that the two phrases above are the same and
> it translates more naturally into code, in addition to being shorter.

I've applied half of this. I also moved 2 to be after 3 in case 3 let to  
something negative.


> The main point here is that many people do not bother to fully read and
> understand all the text, so keeping the key points as brief as possible
> goes a long way of ensuring that people understand them.

If you see more room for simplification please say it. It's much  
appreciated.


> On a further note I would suggest avoiding constructs like If X does not
> have A or B as in "If element A does not have an associated CSS layout
> box or vertical overflow stop this algorithm" -- it's not clear whether
> you stop if just one of them is absent. Using "Unless X has A and/or B"
> would be better.

Why is that not clear?


> There are many terms that you use, like content width, context box with,
> associated CSS layout box, and current rendering mode, that you never
> properly introduce. Links to their definitions would be very useful.

I tried doing this.


> I think Microsoft's MSDN has a nice diagram that illustrates the various
> measures and coordinates, is there a chance you could include something
> similar in the draft?

If someone could contribute such a diagram that would be cool. If this  
isn't done by CR I'll see what I can do.


-- 
Anne van Kesteren
<http://annevankesteren.nl/>
<http://www.opera.com/>
Received on Sunday, 9 March 2008 15:00:04 GMT

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