We learned this technique a long time ago but for a different
application. Web designers have long used this trick to position
text more accurately in web pages. Now it seems this technique
can do double duty by providing a canvas on which web site
promoters can paint their keywords.
We've mentioned before that some engines will index words found in the ALT tag, the tag that describes a graphic image. For this reason, it's a good idea to stuff as many keywords as you can into these tags.
One problem with this technique is that people who browse
with their graphics turned off will see only these lists of
keywords where a graphic might otherwise be seen. Studies
have shown that there are still a good number of people with
slower connections who browse the web in "graphics off" mode.
If you stuffed dozens of keywords into this tag, your web
page will look awful to these folks. For this reason, exercise
prudence when you fill up the ALT tag with keywords so that
your page doesn't look like a hideous gallery of keywords
to these folks.
Using single pixel gifs allows you to have your ALT tag cake
and eat it too. Use the ALT tag normally (a short description
of the graphic only) for the primary graphics on your web
site.
Then, open your favorite graphic editor and create an image that consists of just a single dot (one pixel) the same color as your background (you can even define it as a transparent gif if you want to be extra stealthy). Insert that tiny graphic into your page, preferably near the top for the best effect.
Example:
<IMG SRC=" tinyimage. gif" HEIGHT= 1 WIDTH= 1 BORDER= 0 ALT=" keyword1 keyword2 keyword3 keyword1">
Pretty simple, isn't it? This is just another technique to add keywords invisible to those viewing the Web site but still visible to search engines and valuable for search engine positioning.
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