It is used alternatively to the headers attribute in simple tables.
Acceptable values:
row : Provides header information for the rest of the row.
col : Provides header information for the rest of the column.
rowgroup : Provides header information for the rest of the row group.
colgroup : Provides header information for the rest of the col group.
selected When present, the current option is selected.
Value type: Boolean
shape Defines the type of region that the current area element will represent.
Acceptable values:
default : Specifies the entire region.
rect : Defines a rectangular region.
circle : Defines a circular region.
poly : Defines a polygonal region.
size Specifies the initial width of a control expressed in pixels for all controls but
text and password; in that case it is expressed in number of characters. Using
style rules to fix the size of a control is usually a better option.
Value type: Number
span The number of columns affected by the attributes of the col or colgroup
elements. Default value is 1.
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