keyword positioning seo: density and prominence.
Keyword density simply means how many times the word or phrase appears on
a page. It gets complicated quickly when there are multiple keywords.
There's a formula involving keyword frequency and the number of words on the
phrase as a percentage of the total number of words on the page.
The maximum word density threshold is different with each search engne.
Most "seo software" puts it at around 10 percent for a two-word phrase. Do not
exceed or over-optimize your page's key word density!
This optimizer suggests positioning keywords throughout the page areas:
title, meta tags, comments, headings, link text, body text, alt image
text, link urls and the page text for overall balance.
When placed at the beginning of these areas, keywords are said to have
prominence and score highly for that requirement. When they appear once in
each area, they may satisfy frequency and page distribution requirements.
Remember, do not repeat any single word in the keywords meta tag list and
description meta tag. Use variety to give strength to a page and avoid spamming--or
keyword stuffing--the engines.
Search engines consider "doorways" unnecessary pages, HTTP "tricks"
designed to short-cut page results and "keyword stuffing" to be spam.
Examples: duplicate URLs with similar page content, crosslinked to "boost"
rankings or repeated keyword phrases with the same font color as the
background. Achieving this by way of HTML or style sheets, it's still
spam!
The major engines have their formulas in place to detect the kind of spam
they dislike the most. Search engines often blackball offenders, even
applying a penalty of page rank 0. After the problem is fixed, it can take
many, many weeks or months to get back in the search results.

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