Some search engines will refuse to index a page with a high meta refresh rate. This is the technique of placing text on a page in the same color as the background, making it invisible to human viewers. Many search engines either refuse to index this text or will not index any page containing invisible text. Tiny Text Pages that are predominantly heavy in tiny text may be dismissed as spam. Or, the tiny text may not be indexed.
All search engines have default words that can affect the type of results that are displayed.
Others may include the words but do not normally search for these words during a query, unless directed to do so. Stemming Not all search engines search for variations of a word based on its stem. While this would seem to be an incorrect method of searching for information, its roots are deep within the computing community. Date Some search engines show the date when a Web page was created or modified. This gives an idea about how fresh or stale the search engine's listings may be.