Topic:

<TH> Table Header Cell

Definition:

The TH and TD elements are used for table cells. TH is used for table header cells while TD is used for table data cells. This distinction gives user agents a means to render such cells distinctly, for instance by using a larger or heavier font for header cells.

Attributes:

ID
An SGML identifier used as the target for hypertext links or for naming particular elements in associated style sheets. Identifiers are NAME tokens and must be unique within the scope of the current document.

LANG
This is one of the ISO standard language abbreviations, e.g. "en.uk" for the variety of English spoken in the United Kingdom. It can be used by parsers to select language specific choices for quotation marks, ligatures and hyphenation rules. The language attribute is composed from the two letter language code from ISO 639, optionally followed by a period and a two letter country code from ISO 3166.

CLASS
This a space separated list of SGML NAME tokens and is used to subclass tag names. By convention, class names are interpreted hierarchically, with the most general class on the left and the most specific on the right, where classes are separated by a period. The CLASS attribute is most commonly used to attach a different style to some element, but it is recommended that where practical class names should be picked on the basis of the element's semantics, because this permitsother uses, such as restricting search through documents by matching on element class names. The conventions for choosing class names are outside the scope of this document.

COLSPAN
The number of columns spanned by this cell. This allows you to merge cells across columns. It defaults to 1 (one).

ROWSPAN
The number of rows spanned by this cell. This allows you to merge cells across rows. It defaults to 1 (one).

ALIGN
The ALIGN attribute can be used to explicitly specify the horizontal alignment of paragraphs within a table row:

align=left

Paragraphs are rendered flush left. This is the default for data cells (TD).

align=center

Paragraphs are centered. This is the default for header cells (TH).

align=right

Paragraphs are rendered flush right.

align=justify

Text lines are justified where practical, otherwise this gives the same effect as the align=left setting.

align=decimal

Text lines are indented such that the first occurrence of a decimal point on each line are aligned vertically. If a line doesn't contain a decimal point, the line is rendered flush left for data cells and centered for header cells.

DP
This specifies the character to be used for the decimal point with the ALIGN attribute, e.g. dp="." (the default) or dp=",". The default may be altered by the language context, as set by the LANG attribute on enclosing elements.

VALIGN
The VALIGN attribute can be used to explicitly specify the vertical alignment of material within a table cell:

valign=top

The cell contents appear at the top of each cell (the default).

valign=middle

Cell contents are centered vertically in each cell.

valign=bottom

The cell contents appear at the bottom of each cell.

valign=baseline

This is used when you want to ensure that all cells in the row with valign=baseline share the same baseline. This constraint only applies to the first text line for each cell.

NOWRAP
The NOWRAP attribute is used when you don't want the browser to automatically wrap lines. You can then explicitly specify line breaks in paragraphs using the BR element.

AXIS
This defines an abbreviated name for a header cell, which can be used when rendering to speech. It defaults to the cell's content.

AXES
This is a comma separated list of axis names which together identify the row and column headers that pertain to this cell. It is used when rendering to speech to identify the cell's position in the table. If missing the user agent can try to follow up columns and left along rows (right for some languages) to find the corresponding header cells.

Context:

<TH> is legal within:
<TR>

The following markup can be used within <TH>
<A>, <ABBREV>, <ACRONYM>, <ADDRESS>, <AU>, <B>, <BIG>, <BLOCKQUOTE>, <BQ>, <BR>, <CITE>, <CODE>, <DEL>, <DFN>, <DIR>, <DIV>, <DL>, <EM>, <FIG>, <FN>, <FORM>, <H1>, <H2>, <H3>, <H4>, <H5>, <H6>, <HR>, <I>, <IMG>, <INS>, <ISINDEX>, <KBD>, <LANG>, <MATH>, <MENU>, <NOTE>, <OL>, <P>, <PERSON>, <PRE>, <Q>, <S>, <SAMP>, <SMALL>, <STRONG>, <SUB>, <SUP>, <TAB>, <TABLE>, <TT>, <U>, <UL>, <VAR>

Suggested style/usage:

Close Tag: OPTIONAL

Example:

<TABLE>
<CAPTION>A nice table</CAPTION>
<TR><TH>This</TH><TH>That</TH></TR>
<TR><TD>1</TD><TD>2</TD></TR>
</TABLE>