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[Solved]: Mathematical model for a webpage layout?

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Getting layout right (even if only a structure is considered) with HTML5/CSS3 is still more like an art or black magic.

On the other hand, there are other GUI systems (like wxWindows and Tcl/Tk) and some GUI research (like The Auckland Layout Model, ALM, and other methods), which hint at the possibility of formalization for the layout managers (geometry managers).

Are there any comprehensible formal models for HTML5/CSS, which provide ultracompact (abstract) way to describe structure, "physics" and "geometry" of resizeable webpages, using language of blocks? Also html/css can be generated from it, which works more or less as described in standard browsers. Also, a model can be derived given HTML/CSS (browsers do it by their algorithms, so this seems to be theoretically possible).

By "ultracompact" and abstract it is understood: much more compact than HTML/CSS and also more domain-oriented, "speaking" the language of webpage's dynamics in response to resizing or changed content, that is, higher level than HTML/CSS constructs.

For an analogy, it is possible to write a program to make a textual search, based on some complex rules, but the same task can be performed by a much more compact regular expression. So, is there similar compact language for HTML/CSS layout?

The goals of such a model could be:

  • to verify existing design (model checking)
  • to build robust design given higher level specifications
  • to check whether a set of requirements is consistent with HTML5/CSS3 engine (e.g., does not require writing javascript to make an adjustment too complex for the declarative languages)
  • to be a solid platform for even higher level research on qualities ("to check the harmony with algebra.")

Also it could be a language to use for certain GUI-related abstractions, like is usual in programming language domain, where we do not need to use concrete syntax to express an idea of for-loop and we do have all kinds of nice, proven results about main concepts of algorithmic constructions.

Of course, web-browsers possess algorithmic model for rendering, e.g. popular and simplified description can be found here, but as pointed above it does not have the properties listed above.

Asked By : Roman Susi

Answered By : Roman Susi

At the time of writing, I am not aware of any formal (or at least formalized enough) models for layouts in HTML. All the examples (ALM, etc) indicate, that usually the model is created to guide layout manager's creation. In the case of HTML and web-browsers the development is evolutional and while each web engine contains some sort of algorithmic models to be able to render HTML, nobody (I know of) published underlying math, and nobody "reverse engineered" program code to extract the model.

It should also be noted, that the model could have grown very complex, so any effort to build one retrospectively may be quite costly.

Even though it is not done yet, it does not mean it is impossible. As more rigorous approaches are being applied to web programming (e.g., recent release of Ur/Web - typesafe approach spanning from database to client-side interactions), modelling HTML5 layout management may be on the horizon, especially, as we witness more formal approach in the recommendations for new HTML5/CSS features (for example, http://www.w3.org/TR/css3-flexbox/), because having formal model may help proving consistency of the additions (analogously to formal grammar, which greatly facilitates making additions to the programming language syntax).

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Question Source : http://cs.stackexchange.com/questions/35490

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