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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Color 4: Specifying Lab and LCH</title>
+<link rel="author" title="Chris Lilley" href="mailto:chris@w3.org">
+<link rel="help" href="https://drafts.csswg.org/css-color-4/#specifying-lab-lch">
+<link rel="match" href="lch-005-ref.html">
+<meta name="assert" content="lch() with no alpha, negative a axis (when converted to Lab)">
+<style>
+ .test { background-color: red; width: 12em; height: 6em; margin-top: 0; }
+ .ref { background-color: rgb(10.7506% 75.5575% 66.3981%); width: 12em; height: 6em; margin-bottom: 0; } /* lch(70% 45 180) converted to sRGB */
+ .test { background-color: lch(70% 45 -180); }
+</style>
+<body>
+ <p>Test passes if you see a single square, and not two rectangles of different colors.</p>
+ <div class="ref"></div>
+ <div class="test"></div>
+</body>