HTML

<element name="value">

<head> describes the web page, meta info
<body> visible page content
<header> group of introductory or navigational aids (headings, logo, nav, search)
<footer> (related links, copyright)
<div> defines a division or a section, a container/wrapper
<nav> links to other pages or parts within a page
<aside> tangential content related to its surrounding content, sidebar
<section> grouping of content with heading
<article> a self-contained piece of content (forum post, article, blog entry)
<p> paragraph text
<h1> most important heading
<h2> heading less important than h1
<span> generic inline container
<ul> unordered list
<ol> ordered list
<li> list item
<a> link, stands for anchor