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
  7% (2)
• B
  3% (1)
• C
  17% (5)
• D
  72% (21)

Explanation

W3C's CSS Validation Service lives at www.jigsaw.w3.org, making D correct. The W3C (World Wide Web Consortium) maintains both its HTML validator (validator.w3.org) and its dedicated CSS validator under the Jigsaw project domain - "Jigsaw" was the W3C's own CSS-capable browser, so the name stuck for their CSS tooling.

Why the distractors are wrong:

• A (cynthiasays.com) - a web accessibility checker, not a CSS validator
• B (validator.w3.org) - also a legitimate W3C tool, but it validates HTML/markup, not CSS specifically (this is the trickiest distractor)
• C (vischeck.com) - simulates color-blindness to check visual accessibility, unrelated to CSS syntax validation

Memory tip: Think "Jigsaw for CSS" - just as a jigsaw puzzle has specific rules about how pieces fit together, Jigsaw validates that your CSS rules are correctly written. The key exam trap is confusing validator.w3.org (HTML) with jigsaw.w3.org (CSS) - both are W3C tools, so remember: J for styles, V for markup.

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