TH - Header cell

This element is also available in our updated HTML 4 reference. Some characteristics may have changed.

Appearance:	<TH> [</TH>]
Attributes:	ROWSPAN=`n`, COLSPAN=`n`, NOWRAP, ALIGN=left\|right\|center, VALIGN=top\|middle\|bottom, WIDTH=`n`, HEIGHT=`n`
Contents:	H1, H2, H3, H4, H5, H6, P, UL, OL, DIR, MENU, PRE, DL, DIV, CENTER, BLOCKQUOTE, FORM, HR, TABLE, ADDRESS as well as TT, I, B, U, STRIKE, BIG, SMALL, SUB, SUP, EM, STRONG, DFN, CODE, SAMP, KBD, VAR, CITE, A, APPLET, IMG, FONT, BASEFONT, BR, MAP, INPUT, SELECT, TEXTAREA and plain text.
May occur in:	TR.

Like the TD tag, a TH is used for a table cell. However, TH should be used when the cell's contents is a table heading, not a data cell. Typically this is done when the contents of the cell is a label for a row or column in the table.

See the section on TD for an explanation of the various attributes.

For an example on how to construct tables, please see the section on the TABLE tag.

Notes:

While it's not strictly required, it is good practice to close each table cell explicitly. It makes your table easier to read.
If you include a table inside a table cell, be sure to close all cells and rows. It is not required, but some browsers get the nested tables wrong and render them incorrectly.
An empty cell is usually rendered differently than a cell with just whitespace inside it. This especially shows if you have a border defined for your table.
If you use images in a table cell, be sure to specify the WIDTH and HEIGHT attributes in the IMG tag. This allows the browser to determine the size of the cell in advance, so it can draw the table before the image is loaded. Otherwise, the table will not appear until the image has been loaded. This can mean a considerable delay before your page displays.

HTML 3.2 Reference ~ Elements by Function ~ Elements Alphabetically

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