Common HTML elements that contribute to search engine optimization

seo.html

<!-- Here are some common elements to look for in a web page's HTML code -->

<!-- The 'description' meta tag gives us a short summary of the page as seen 
by search engines -->
<meta name="description" content="A short description of the website that will 
show up below the page title in search engines"/>

<!-- The 'keywords' meta tag lists important keywords that the page wants to 
rank well for in search engines. Using too many keywords can devalue each 
individual keyword -->
<meta name="keywords" content="a,comma,separated,list,of,keywords,about,the,page"/>

<!-- 'a' tags are links to other web pages. Looking at what a page links to can 
provide insight into SEO strategy. Is the page mostly linking to external sites 
in the hope of being linked to in return? Or are the links mostly internal to 
keep visitors on the domain? -->
<a href="http://domainurl.com/pageurl" title="A descriptive title of the link 
that is useful for SEO purposes">
    My Link Text
</a>

<!-- Sometimes innocuous tags will have interesting 'class' or 'id' names 
attached to them, allowing you greater insight into the purpose of a certain 
part of a page -->
<a class="important-call-to-action" href="http://domainurl.com/signup">
    Sign up here!
</a>
<p id="top-content">
    Corgis are the best breed of dog ever
</p>