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[Bug 18346] Desire to define "Block container element"

From: <bugzilla@jessica.w3.org>
Date: Mon, 23 Jul 2012 23:10:37 +0000
Message-Id: <E1StRlt-0002sE-79@jessica.w3.org>
To: public-css-bugzilla@w3.org
https://www.w3.org/Bugs/Public/show_bug.cgi?id=18346

--- Comment #3 from Anton P <antonsforums@yahoo.co.uk> 2012-07-23 23:10:37 UTC ---
Proposal C omitted 'table-cell' from the list of 'display' values which make a
non-replaced element a block container element.  The following proposal
corrects that by adding that single term to the list.

The following proposal factors the block container stuff out to 9.2 in addition
to the principal box stuff factored out in Proposal B.

Proposal D:

  # 9.2 Controlling box generation
  #
  # The following sections describe the types of boxes that may be
  # generated in CSS 2.1. A box's type affects, in part, its behavior
  # in the visual formatting model. The 'display' property, described
  # below, specifies a box's type.
  #
  # <ins>Each _block-level element_<link to 9.2.1>, inline block,
  # inline table and table cell generates a *principal box* that
  # contains descendant boxes and generated content and is also the
  # box involved in any positioning scheme. Some block-level elements
  # may generate additional boxes in addition to the principal box:
  # 'list-item' elements. These additional boxes are placed with
  # respect to the principal box.</ins>
  #
  # <ins>*Block container elements* are non-replaced elements whose
  # principal box is a block container box. A *block container box*
  # either contains only _block-level boxes_<link to 9.2.1> or
  # establishes an _inline formatting context_<link to 9.4.2> and thus
  # contains only _inline-level boxes_<link to 9.2.2>. The following
  # values of the 'display' property make a non-replaced element a
  # block container: 'block', 'list-item', 'table', 'inline-block',
  # 'inline-table', 'table-cell'.</ins>
  #
  #
  # 9.2.1 Block-level elements and block boxes
  #
  # *Block-level elements* are those elements of the source document
  # that are formatted visually as blocks (e.g., paragraphs). The
  # following values of the 'display' property make an element
  # block-level: 'block', 'list-item', and 'table'.
  #
  # <del>Block-level boxes are boxes that participate in a block
  # formatting context. Each block-level element generates a principal
  # block-level box that contains descendant boxes and generated
  # content and is also the box involved in any positioning scheme.
  # Some block-level elements may generate additional boxes in
  # addition to the principal box: 'list-item' elements. These
  # additional boxes are placed with respect to the principal box.</del>
  #
  # <ins>The principal box of a block-level element is a block-level
  # box. *Block-level boxes* are boxes that participate in a block
  # formatting context.</ins> Except for table boxes, which are
  # described in a later chapter, and <ins>the principal box of</ins>
  # replaced elements, a block-level box is also a block container box.
  # <del>A block container box either contains only block-level boxes
  # or establishes an inline formatting context and thus contains only
  # inline-level boxes. Not all block container boxes are block-level
  # boxes: non-replaced inline blocks and non-replaced table cells are
  # block containers but not block-level boxes.</del> Block-level boxes
  # that are also block containers are called block boxes.
  #
  # <ins>Non-replaced inline blocks and non-replaced table cells are
  # block containers but are not block-level.</ins>
  #
  # The three terms "block-level box," "block container box," and
  # "block box" are sometimes abbreviated as "block" where unambiguous.


The Notes for Proposal B above apply to Proposal D too.  Proposal D also
reiterates the fact that block container elements are non-replaced.


Proposal: based on
http://lists.w3.org/Archives/Public/www-style/2012Jul/0504.html , adding
'table-cell' to the list of 'display' values giving rise to a block container
element.

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Received on Monday, 23 July 2012 23:10:38 GMT

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