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Program Limitations

CSE HTML Validator does not and cannot completely check a document for 100% correct syntax. However, HTML Validator will detect many syntactical errors including most common errors such as misspelled tag names, attributes, and attribute values, missing quotation marks, missing end tags, mismatching '<' and '>' characters, and using tags in incorrect locations. Using CSE HTML Validator is far better than not using anything at all. "It is better to have validated and failed than never to have validated at all." Note that CSE HTML Validator Professional has a significantly more powerful syntax checking engine than CSE HTML Validator Lite and can therefore detect many more syntax problems.
(This should not be considered a limitation) HTML 3.2 and 4.0 do not require "head" and "body" tags but due to the current design of enforcing good style, these tags are required for proper validation (and it's always safer to have them than to not). In addition, some tags may need to be closed for proper validation by HTML Validator (such as "td") even though in HTML 3.2 and 4.0 they do not have to be. Many web developers and companies, including AI Internet Solutions, would not consider this a limitation, but would instead consider it good style.
Validation becomes much slower as the size of the document increases. Because of this, it is not recommended that you check excessively large documents (1 megabyte or over).

It is important to note that HTML Validator is not a "real" HTML Validator. This means that it does not check HTML documents according to a DTD. Instead, it uses a more powerful validation engine that is custom designed for HTML. Because of this, HTML Validator can:

Detect many problems that a DTD validator cannot detect.
Enforce better style.
Provide tips, compatibility messages, and advice (most of these types of messages require the professional version).
Display easier to understand validator messages.
Be customized and configured to a user's specifications.

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