How can text been hidden? Well, there are a variety of ways - some are more sneaky than others. But is boils down to this: it is considered hidden if the text or link is invisible to the website visitor but can be seen by search engine spiders. This used to be done quite often, such as making your text white on a white background or using cascading style sheets (CSS) to hide your text, but search engines can easily spot this today so it is best to avoid it altogether.
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