DTD referrs to the doc type and indicated which tags are allowed F = Frameset, S = Strict T = Transitional.

Tag Description DTD XHTML 1.1
<!--...--> Comment in HTML FST YES
<!DOCTYPE> Sets document type FST YES
<a> Sets an anchor FST YES
<abbr> Sets an abbreviation FST YES
<acronym> Sets an acronym FST YES
<addres> Sets contact information for the author/owner of a document FST YES
<applet> Deprecated: Sets an embedded applet FT NO
<area /> Sets an area inside an image-map FST NO
<b> Sets bold text FST YES
<base /> Sets a default address or default target for all links on a page FST YES
<basefont /> Deprecated: Sets a default font, color, or size for the text in a page FT NO
<bdo> Sets text direction FST NO
<big> Sets big text FST YES
<blockquote> Sets a long quotation FST YES
<body> Sets a document's body FST YES
<br /> Sets a single-line break FST YES
<button> Sets a push button FST YES
<caption> Sets a table caption FST YES
<center> Deprecated: Sets center text FT NO
<cite> Sets a citation FST YES
<code> Sets computer code text FST YES
<col /> Sets attribute values for one or more columns in a table  FST NO
<colgroup> Sets a group of columns in a table for formatting FST NO
<dd> Sets a description of a term in a definition list FST YES
<del> Sets deleted text FST NO
<dfn> Sets a definition term FST YES
<dir> Deprecated: Sets a directory list FT NO
<div> Sets a block-level section of a document FST YES
<dl> Sets a definition list FST YES
<dt> Sets a definition term (or item) FST YES
<em> Sets emphasized (or italic) text FST YES
<fieldset> Sets a border around elements in a form FST YES
<font> Deprecated: Sets font, size, and color for text FT NO
<form> Sets a form for user input FST YES
<frame /> Sets a window in a frameset F NO
<frameset> Sets a set of frames F NO
<h1> to <h6> Sets different headings FST YES
<head> Sets the head section of an HTML document FST YES
<hr /> Sets a horizontal line FST YES
<html> Sets an HTML document FST YES
<i> Sets italic (or emphasized) text FST YES
<iframe> Sets an inline frame FT NO
<img /> Sets an image FST YES
<input /> Sets an input field in a form FST YES
<ins> Sets inserted text FST NO
<isindex> Deprecated: Sets a searchable index related to a document FT NO
<kbd> Sets keyboard text FST YES
<label> Sets a label for an input element FST YES
<legend> Sets a legend for a fieldset FST YES
<li> Sets a list item FST YES
<link /> Sets the relationship between a document and an external resource FST YES
<map> Sets an image-map FST NO
<menu> Deprecated: Sets a menu list FT NO
<meta /> Sets metadata about the document FST YES
<noframes> Sets alternative content for users who do not support frames FT NO
<noscript> Sets alternative content for users who do not support client-side scripts e.g. JavaScript FST YES
<object> Sets an embedded object FST YES
<ol> Sets an ordered list FST YES
<optgroup> Sets a group of related options in a form select list FST YES
<option> Sets an option in a form select list FST YES
<p> Sets a paragraph FST YES
<param /> Sets a parameter for an object FST YES
<pre> Sets preformatted text FST YES
<q> Sets a short quotation FST YES
<s> Deprecated: Sets strikethrough text FT NO
<samp> Sets sample computer code FST YES
<script> Sets a script type FST YES
<select> Sets a drop down list FST YES
<small> Sets small text FST YES
<span> Sets a inline-section of a document FST YES
<strike> Deprecated: Sets strikethrough text FT NO
<strong> Sets strong (or bold) text FST YES
<style> Sets an internal style sheet FST YES
<sub> Sets subscript text FST YES
<sup> Sets superscript text FST YES
<table> Sets a table FST YES
<tbody> Groups a table body FST NO
<td> Sets a table cell FST YES
<textarea> Sets a textarea for an input field FST YES
<tfoot> Groups a table footer area FST NO
<th> Sets a table header cell FST YES
<thead> Groups a table header area FST NO
<title> Sets the title of the document FST YES
<tr> Sets a table row FST YES
<tt> Sets teletype text FST YES
<u> Deprecated: Sets underlined text FT NO
<ul> Sets an unorderd list FST YES
<var> Sets a variable part of a text FST YES
<xmp> Deprecated: Sets preformatted text None NO
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