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2.1.15 [HTML] Section 11.2.4, Column groups: the COLGROUP and COL elements

V0016:

The specification states:

width = multi-length [CN]

This attribute specifies a default width for each column in the current column 
group. In addition to the standard pixel, percentage, and relative values, this 
attribute allows the special form "0*" (zero asterisk) which means that the width 
of the each column in the group should be the minimum width necessary to hold the 
column's contents. This implies that a column's entire contents must be known 
before its width may be correctly computed. Authors should be aware that specifying 
"0*" will prevent visual user agents from rendering a table incrementally.

All Document Modes (All Versions)

Relative values (such as "2*") and the special form "0*" are not supported. When a cell spanning multiple columns has content, the amount of content in the multi-column cell can increase the width of other cells in any of the spanned columns. For more information on table layout algorithms, see [MS-CSS21] section 2.1.86.

V0017:

The specification states:

width = multi-length [CN]

This attribute specifies a default width for each column spanned by the current COL 
element. It has the same meaning as the width attribute for the COLGROUP element 
and overrides it.

All Document Modes (All Versions)

When a cell spanning multiple columns has content, the amount of content in the multi-column cell can increase the width of other cells in any of the spanned columns. In addition, relative widths (such as 2*) and the special case 0* are not supported. For more information on table layout algorithms, see [MS-CSS21] section 2.1.86.

V0018:

The specification states:

Attributes defined elsewhere

* id, class (document-wide identifiers) 
* lang (language information), dir (text direction) 
* title (element title) 
* style (inline style information ) 
* onclick, ondblclick, onmousedown, onmouseup, onmouseover, onmousemove,
  onmouseout, onkeypress, onkeydown, onkeyup (intrinsic events) 
* align, char, charoff, valign (cell alignment)

All Document Modes (All Versions)

The attributes char and charoff are not supported.

All Document Modes (All Versions)

The bgcolor attribute is also supported on COL elements.

V0019:

The specification states:

Fixed 

A fixed width specification is given in pixels (e.g., width="30"). A fixed-width 
specification enables incremental rendering.

All Document Modes (All Versions)

Content in cells that span multiple columns can cause the width of cells in one of those columns to become larger than intended. For more information on table layout algorithms, see [MS-CSS21] section 2.1.86.

V0020:

The specification states:

Proportional 

Proportional specifications (e.g., width="3*") refer to portions of the horizontal 
space required by a table. If the table width is given a fixed value via the width 
attribute of the TABLE element, user agents may render the table incrementally even 
with proportional columns.

All Document Modes (All Versions)

Proportional width specifications are not supported.

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