•Maximum errors - This edit box lets you specify the number of errors that CSS HTML Validator will generate for a single HTML document before terminating the validation due to too many errors. We recommended that you do not set this to more than 20 errors, since one "true" error can cause many other "phantom" errors to be generated that may not necessarily provide useful information. Correct the first few errors of a document, and then revalidate it to see how the correction of the first few errors affect the remaining errors; they may all disappear. Accepted values range from 1 to 9999, inclusive, although high values are not recommended. Can be overridden using setValueInt(). The default is 20 errors.
•Maximum warnings - This edit box lets you specify the number of warnings that CSS HTML Validator will generate for a single document before terminating the validation due to too many warnings. Accepted values range from 1 to 9999, inclusive, although high values are not recommended. Can be overridden using setValueInt(). The default in v16.02+ is 30 warnings (older versions default to 20 warnings).
•Warning messages - Check this box to show any warning messages that are generated during a validation. This box must be checked to receive any warning messages, even if Show comment warnings is checked. It is highly recommended that you keep this option enabled (most warning messages are usually important). This option is enabled by default.
•Non-error, non-warning, non-comment messages (regular messages) - Check this box if you want HTML Validator to show any non-error, non-warning, and non-comment messages generated when a HTML document is validated. These messages typically have a blue box in front of them when displayed in the Results Window and contain miscellaneous and generally useful information. Note that messages in the context of this option are messages generated by the validator engine that are not errors, warnings, or comments. It is highly recommended that you keep this option enabled. This option is enabled by default.
•Comment messages - Check this box if you want HTML Validator to show comment messages generated when an HTML document is validated. These comments may provide you with useful information. Some comments are dependent on the kind of errors and warnings generated. We recommended that you keep this option enabled and that you read any comments that are produced. This option is enabled by default.
•Extended message info when available - Check this box if you want to enable extended messages. Currently extended messages include displaying the actual valid and invalid range when a tag is out of range, displaying the valid attributes when an invalid attribute is used, displaying the valid attribute values for an attribute when an invalid attribute value is used, and displaying extra information (or including more elaboration) in some other messages. Disabling extended messages simplify certain messages but also reduce the amount of information contained in them. This option is enabled by default.
•Upgrade warning messages to error messages - Check this box to change (upgrade) warning messages to error messages. You may want to check this box if you consider warning messages to be as serious as error messages and therefore want warning messages to be treated the same as error messages. This option is not enabled by default.
•Enable override by message ID - Most (but not all) validator messages have a unique message ID. This unique message ID can be used to disable individual messages or to change an individual message's type (for example, from a warning to an error). This is normally done by bringing up the context menu for the individual message and choosing an option under Message Options.
When Enable override by message ID is checked, changes to messages by message ID (or by exact text match) will take effect (this is the default). This means that if you disabled an individual message or changed a message's type, then the change that you made will override the default state. If this option is unchecked, then the changes will not override the default state but the messages that would have been affected if this option were checked will be indicated by an [OVERRIDE ...] string in the message. By temporarily unchecking this option, you can see what changes have been made and you can enable a message that has previously been disabled.
This option is enabled by default.