Validating a page

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Note: You must enter the data validation formula for cell A2 first, then copy A2 to A3: A10 so that the second argument to the COUNTIF will match the current cell.

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Validation, as any process of debugging code, is sometimes difficult, and the vast improvements in automatic error correction has made modern browser cope very well with errors in HTML or CSS.The original version was written by Nick Kew of WebÞing Ltd.for their Site Valet service and he has generously donated it for our use.This makes validation seem useless or costly to many people, and the following questions (or statement) are widespread: The answer to this one is that markup languages are no more than data formats. It only takes on a visual appearance when it is presented by your browser.In practice, different browsers can and do display the same page very differently.

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