Which statement about validating markup is true?

Which statement about validating markup is true?

• A. Validation always passes when code is well-formed.
• B. Validation depends on external resources.
• C. If a validator finds an error, the remaining code on the page may fail validation, even if the remaining code is actually valid.
• D. Validation errors only occur in HTML attributes.

Answer: (C)

Validating markup checks conformance to HTML standards beyond just syntax. A document can be well-formed yet not valid if it uses tags incorrectly, omits required attributes, or nests elements in ways that violate the spec. In HTML parsing, an early error can change how the rest of the page is interpreted, so a validator may flag later code as invalid even if that later code would be valid in isolation. That’s why a single issue can cause the validator to report problems further down the page. External resources aren’t the deciding factor for validity in typical HTML checks, and errors can occur anywhere in the markup, not just in attributes, while well-formedness doesn’t guarantee validity. This illustrates why an early error can lead to cascading validation results.

Validating markup checks conformance to HTML standards beyond just syntax. A document can be well-formed yet not valid if it uses tags incorrectly, omits required attributes, or nests elements in ways that violate the spec. In HTML parsing, an early error can change how the rest of the page is interpreted, so a validator may flag later code as invalid even if that later code would be valid in isolation. That’s why a single issue can cause the validator to report problems further down the page. External resources aren’t the deciding factor for validity in typical HTML checks, and errors can occur anywhere in the markup, not just in attributes, while well-formedness doesn’t guarantee validity. This illustrates why an early error can lead to cascading validation results.