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+<!doctype html>
+<link rel="help" href="https://www.w3.org/TR/css-values-4/#calc-computed-value">
+<link rel="help" href="https://www.w3.org/TR/CSS2/visudet.html#the-height-property">
+<link rel="author" title="Xiaocheng Hu" href="mailto:xiaochengh@chromium.org">
+<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
+<title>0% in calc() should be preserved</title>
+<script>
+CSS.registerProperty({
+ name: '--custom-height',
+ syntax: '<length-percentage>',
+ initialValue: 'calc(0% + 0px)',
+ inherits: false
+});
+</script>
+<style>
+.height-filler {
+ height: 100px;
+}
+
+.test {
+ width: 100px;
+ height: var(--custom-height);
+ background-color: green;
+}
+</style>
+<p>Test passes if there is a filled green square.</p>
+<div class="test">
+ <div class="height-filler">
+ </div>
+</div>