Background
Search Engines use a number of criteria to decide what a given
web page is all about. These criteria, which can be different
from Search Engine to Search Engine, and which may even change
over time, all aim at deciding how "relevant" a page is to a
given user's search. The Search Engine wants to return the
results most relevant to a user's search.
While the particulars may change over time, there are some
criteria which remain constant. One of these is where the
keywords are located on the page. Typically words that are
located closer to the beginning of a page are considered more
important than words that occur further down the page. This
stands to reason: think of a newspaper article, where the
headline and the first paragraph usually have more "meat" than
the rest of the story.
Another measure of relevance is "keyword density". This is
roughly the ratio of keywords on a page to the total number of
words on a page. Having a higher ratio of keywords to total
words will make a page more relevant for a search on those
keywords.
When a Search Engine sends its robot out to look at your page,
you want to make sure that it finds important information near
the top of the web page, and that the page has a high keyword
density. Sometimes there are complications, even when you have a
lot of keyword-rich text early in the visible portion of your
page. Two of these complications, extensive JavaScript code and
extensive Cascading Style Sheet code, can be easily remedied.
JavaScript problem
Large amounts of JavaScript code can get in the way. Typically
the largest amount of JavaScript code in a web page is found in
the HEAD section. This is usually where variables and functions
are defined, and so forth.
Unfortunately, having a large amount of JavaScript code in a
page can be detrimental to a page's ranking in the Search
Engines.
Since Search Engines tend to pay more attention to text at the
beginning of a web page than they do to text further from the
beginning, it stands to reason that if you have several dozen
lines of JavaScript code at the top of the page, your real
content is going to be further from the beginning of the page.
Further down the page means less important to the Search Engine.
Keyword density is also important. Here again, if you have
several hundred words of JavaScript code in a page, the keyword
density—the ratio of your keywords to all the words in the whole
page, both text and code—is going to be much lower. That means
that some Search Engines will decide that your page is less
relevant.
JavaScript solution
So how do you maintain JavaScript functionality, but make your
page as Search Engine-friendly as possible? You put the
JavaScript code into a separate file, and link it back to the
web page.
The original page, "mypage.html", may look something like this.
<html> <head> <title>My Title< itle> <script> function
helloWorld(){ alert("Hello, World!"); return; } </script>
</head> <body onLoad="helloWorld()">
...body of page...
</body> </html>
Example 1—mypage.html with JavaScript code
We replace the JavaScript code with an instruction for the
browser to go and grab the code from a separate file. The new
page will look like this.
<html> <head> <title>My Title< itle> <script
src="codepage.js"></script> </head> <body onLoad="helloWorld()">
...body of page...
</body> </html>
Example 2—mypage.html with JavaScript code offloaded
Note the addition of the "src" attribute to the SCRIPT tag. The
value assigned to that attribute is the name of the external
file that contains the JavaScript code. Typically, these
external files will be given the filename extension ".js" to
indicate that they contain JavaScript code. Note also that there
are both <script> and </script> tags here, even though there is
nothing between those tags.
A new page is then created that holds the code that was formerly
held in the SCRIPT tags. We will call it "codepage.js", and it
looks like this.
function helloWorld(){ alert("Hello, World!"); return; }
Example 3—codepage.js includes only JavaScript code
This new file doesn't need any kind of HTML markup. It contains
only the code that was originally held between the SCRIPT tags.
Style Sheet problem
In addition to JavaScript code, Style Sheet code can cause
complications for Search Engines when it is put into a web page.
For the same reasons as JavaScript—moving the important content
further down the page, and diluting the keyword density—it is
important to move Style Sheet code off of the page as well.
Style Sheet solution
The thought behind removing Style Sheet information from a page
is very similar to that of offloading JavaScript; the syntax to
do so is different.
The original page, "mypage.html", may look something like this.
<HTML> <HEAD> <TITLE>My Title</TITLE> <style> body{
background:white; color:red; } </style> </HEAD>
<BODY>
...body of page...
</BODY> </HTML>
Example 4—mypage.html with style sheet code
We want to move this code into a separate file, so we remove it
from the original page, and add a link to point to the separate
file that now holds the Style Sheet code.
<HTML> <HEAD> <TITLE>My Title</TITLE> <link rel='stylesheet'
href='style.css' type='text/css'> </HEAD>
<BODY>
...body of page...
</BODY> </HTML>
Example 5—mypage.html with Style Sheet code offloaded
Note the addition of the LINK tag. This contains three types of
information that the browser will need to reconstruct the page
when a visitor looks at it. The "rel='stylesheet'"
attribute/value pair indicates that we are looking at a Style
Sheet file here. The "href='style.css'" attribute/value pair
points to the external file that contains the Style Sheet
information. Typically these external files will be given the
filename extension ".css" to indicate that they contain
Cascading Style Sheet code. You will replace the filename
"style.css" with the name of the actual file into which you
place your stylesheet code. Finally, we have to specify the MIME
type of the file, in the "type='text/css'" attribute/value pair.
A new page is then created that holds the code that was formerly
held in the STYLE tags. We will call it "style.css", and it
looks like this.
body{ background:white; color:red; }
Example 6—style.css includes only Style Sheet code
This new file doesn't need any kind of HTML markup. It contains
only the code that was originally held between the STYLE tags.
Conclusion
By following these two procedures, you have now made your web
page more friendly to the Search Engines. This means that the
next time your page is spidered by the Search Engine robots, the
important content on your page will be closer to the top of the
page, and you will have a better keyword density. This will
result in your page appearing higher in the Search Engine
listings, and will probably bring more traffic to your website.
When you are ready to put your website to work for you, it's
time to contact us.
Search Innovation Your Search is Over™
http://www.searchinnovation.com info@searchinnovation.com
Copyright © 2002 Search Innovation. All Rights Reserved.
About the author:
Dale Goetsch is a Search Engine Marketing Consultant for Search
Innovation, a Search Engine Marketing company serving small
businesses. His background includes over twelve years as a
software tester, as well as Perl, JavaScript and ASP
programming.