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Although most major browsers will tolerate many of the errors, and will display a document successfully even if it contains errors, they may misbehave on documents that contain the errors: for example, they may go to the wrong section or citation if you click the mouse on a wikilink.Checking that a page contains valid HTML can thus fix these minor glitches while also increasing portability to unusual browsers.Mark-up validators cannot see the "big picture" on a web page, but they excel at picking up missed closing tags and other technicalities.DTD-based validators are also limited in their ability to check attribute values according to many specification documents.If so, it allows it to be submitted to the server and (usually) saved in a database; if not, it gives you error messages to explain what you've done wrong (provided you've done it right).Form validation can be implemented in a number of different ways.

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Note that I also left off the period after “This is a sentence” above, which violates the rules of grammar, but likely doesn’t cause any problems in communication.Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format we need to process it successfully, and that it won't break our applications.We also want to help our users to fill out our forms correctly and don't get frustrated when trying to use our apps.For example, using an HTML 4.01 DOCTYPE, bgcolor="fffff" is accepted as valid for the "body" element even though the value "fffff" is missing a preceding '#' character and contains only five (instead of six) hexadecimal digits.Also, for the "img" element, width="really wide" is also accepted as valid.