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--- notes:html_cheat_sheet [2026/11/03 08:46]
186.244.138.50 old revision restored (2026/08/04 09:30)
+++ notes:html_cheat_sheet [2026/11/04 18:00] (current)
47.79.207.195 old revision restored (2026/10/06 13:16)
@@ Line 163: / Line 163: @@
     * keyboard events: onkeydown, onkeypress, onkeyup
     * mouse events: onclick, ondblclick, onmousedown, onmousemove, onmouseup, onmouseover, onmouseup
+==== XHTML ====
+  * XHTML is a stricter and cleaner replacement for HTML defined as an XML format.
+  * XHTML requires elements to be closed, properly nested and lowercase.
+  * Documents must have a DOCTYPE declaration and only a single root element. They must have a head with a title and a body.
+  * Attributes must be lowercase with quoted values and must have values (e.g. checked="checked").
+  * id replaces the name attribute, xml:lang replaces lang but both should be used for compatibility.
+  * There are three XHTML variations
+    * Strict - No presentational attributes allowed <code html>
+<!DOCTYPE html
+PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"></code>
+    * Transitional - Presentational attributes allowed but no frames <code html><!DOCTYPE html
+PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"></code>
+    * Frameset - Allows presentational attributes and frames <code html>
+<!DOCTYPE html
+PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd"></code>

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