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--- notes:html_cheat_sheet [2026/09/13 16:12]
47.79.207.65 old revision restored (2026/09/04 14:04)
+++ notes:html_cheat_sheet [2026/09/16 06:36] (current)
2.51.163.142 old revision restored (2026/08/02 14:17)
@@ Line 120: / Line 120: @@
 ==== Character Entities ====
-  * A character entity represents a single character. [[http://www.w3schools.com/tags/ref_entities.asp | All named entities]].
+  * A character entity represents a single character. [[http://www.w3schools.com/tags/ref_entities.asp | Character entities]] [[http://www.w3schools.com/tags/ref_symbols.asp | Symbol Entities]].
   * It consists of an ampersand (&), an entity name or a # and an entity number, and finally a semicolon (;) (e.g. &#60;).
   * Common character entities include: &gt; , &lt; , &nbsp; (space), &quot; , &apos; .
@@ 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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