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<h3>Reftests (reference tests)</h3>
<p>A <a href="http://testthewebforward.org/docs/reftests.html">reftest</a> are one of the testing format used in W3C and browser vendors for testing features that add visual effects to a page such as CSS and SVG. A reftest are madte of two (or more) files: a test case made using features to test, and reference file(s) made using widely-implemented-and-deployed features (e.g. CSS2). On conforming implementation the reference and the test case will visually match