Which Web-based validation tool is used to validate Cascading Style Sheets (CSS)?

Question

Options

• Awww.cynthiasays.com
• Bwww.validator.w3.org
• Cwww.vischeck.com
• Dwww.jigsaw.w3.org

• A
  4% (1)
• C
  7% (2)
• D
  89% (24)

Explanation

W3C CSS Validation Service (jigsaw.w3.org) is the official tool maintained by the World Wide Web Consortium specifically for validating CSS code, checking it against CSS specifications and flagging syntax errors or non-conformant properties.

Why the distractors are wrong:

• A (cynthiasays.com) - Cynthia Says is a web accessibility checker, not a CSS validator.
• B (validator.w3.org) - This is also a W3C tool, but it validates HTML/markup, not CSS. It's a common trap since it's on the same domain.
• C (vischeck.com) - Vischeck simulates how pages appear to people with color vision deficiencies; it has nothing to do with CSS syntax validation.

Memory tip: Think "Jigsaw = CSS pieces fitting together" - a jigsaw puzzle is about making pieces conform to a pattern, just like the Jigsaw CSS validator checks that your stylesheet conforms to the CSS specification. The W3C runs two validators: validator.w3.org for HTML and jigsaw.w3.org for CSS - knowing both helps you avoid the B vs. D trap.

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