Basic Tags
<html></html> Creates an HTML document
<head></head> Sets off the title and other information that isn't displayed on the Web page itself
<body></body> Sets off the visible portion of the document

Header Tags
<title></title> Puts the name of the document in the title bar

Body Attributes
<body bgcolor=?> Sets the background color, using name or hex value
<body text=?> Sets the text color, using name or hex value
<body link=?> Sets the color of links, using name or hex value
<body vlink=?> Sets the color of followed links, using name or hex value
<body alink=?> Sets the color of links on click

Text tags
<pre></pre> Creates preformatted text
<h1></h1> Creates the largest headline
<h6></h6> Creates the smallest headline
<b></b> Creates bold text
<i></i> Creates italic text
<tt></tt> Creates teletype, or typewriter-style text
<cite></cite> Creates a citation, usually italic
<em></em> Emphasizes a word (with italic or bold)
<strong></strong> Emphasizes a word (with italic or bold)
<font size=?></font> Sets size of font, from 1 to 7
<font color=?></font> Sets font color, using name or hex value

Links
<a href="URL"></a> Creates a hyperlink
<a href="mailto:EMAIL"></a> Creates a mailto link
<a name="NAME"></a> Creates a target location within a document
<a href="#NAME"></a> Links to that target location from elsewhere in the document

Formatting
<p> Creates a new paragraph
<p align=?> Aligns a paragraph to the left, right, or center
<br> Inserts a line break
<blockquote>
</blockquote> 		Indents text from both sides
<dl></dl> Creates a definition list
<dt> Precedes each definition term
<dd> Precedes each definition
<ol></ol> Creates a numbered list
<li> Precedes each list item, and adds a number
<ul></ul> Creates a bulleted list
<li> Precedes each list item, and adds the bullet
<div align=?> A generic tag used to format large blocks of HTML, also used for stylesheets

Graphical Elements
<img src="name"> Adds an image
<img src="name" align=?> Aligns an image: left, right, center; bottom, top, middle
<img src="name" border=?> Sets size of border around an image
<hr> Inserts a horizontal rule
<hr size=?> Sets size (height) of rule
<hr width=?> Sets width of rule, in percentage or absolute value
<hr noshade> Creates a rule without a shadow

Tables
<table></table> Creates a table
<tr></tr> Sets off each row in a table
<td></td> Sets off each cell in a row
<th></th> Sets off the table header (a normal cell with bold, centered text)

Table Attributes
<table border=#> Sets width of border around table cells
<table cellspacing=#> Sets amount of space between table cells
<table cellpadding=#> Sets amount of space between a cell's border and its contents
<table width=# or %> Sets width of table - in pixels or as a percentage of document width
<tr align=?> or <td align=?> Sets alignment for cell(s) (left, center, or right)
<tr valign=?> or <td valign=?> Sets vertical alignment for cell(s) (top, middle, or bottom)
<td colspan=#> Sets number of columns a cell should span (default=1)
<td rowspan=#> Sets number of rows a cell should span (default=1)
<td nowrap> Prevents the lines within a cell from being broken to fit

Frames
<frameset></frameset> Precedes the <body> tag in a frames document; can also be nested in other framesets
<frameset rows="value,value"> Defines the rows within a frameset, using number in pixels, or percentage of width
<frameset cols="value,value"> Defines the columns within a frameset, using number in pixels, or percentage of width
<frame> Defines a single frame - or region - within a frameset
<noframes></noframes> Defines what will appear on browsers that don't support frames

Frames Attributes
<frame src="URL"> Specifies which HTML document should be displayed
<frame name="name"> Names the frame, or region, so it may be targeted by other frames
<frame marginwidth=#> Defines the left and right margins for the frame; must be equal to or greater than 1
<frame marginheight=#> Defines the top and bottom margins for the frame; must be equal to or greater than 1
<frame scrolling=VALUE> Sets whether the frame has a scrollbar; value may equal "yes," "no," or "auto." The default, as in ordinary documents, is auto.

<frame noresize> Prevents the user from resizing a frame

Forms
For functional forms, you'll have to run a CGI script. The HTML just creates the appearance of a form.
<form></form> Creates all forms
<select multiple name="NAME" size=?></select> Creates a scrolling menu. Size sets the number of menu items visible before you need to scroll.
<option> Sets off each menu item
<select name="NAME"></select> Creates a pulldown menu

<option> Sets off each menu item
<textarea name="NAME"
cols=40 rows=8></textarea>		 Creates a text box area. Columns set the width; rows set the height.
<input type="checkbox"
name="NAME">		 Creates a checkbox. Text follows tag.
<input type="radio"
name="NAME" value="x">		 Creates a radio button. Text follows tag
<input type=text
name="foo" size=20>		 Creates a one-line text area. Size sets length, in characters.
<input type="submit"
value="NAME">		 Creates a Submit button
<input type="image" border=0
name="NAME" src="name.gif">		 Creates a Submit button using an image
<input type="reset"> Creates a Reset button