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diff --git a/testing/web-platform/tests/css/css-display/display-contents-computed-style.html b/testing/web-platform/tests/css/css-display/display-contents-computed-style.html
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+++ b/testing/web-platform/tests/css/css-display/display-contents-computed-style.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Display: Computed style for display:contents</title>
+<link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
+<link rel="help" href="https://drafts.csswg.org/css-display-3/#valdef-display-contents">
+<link rel="help" href="https://drafts.csswg.org/css-display-3/#transformations">
+<link rel="help" href="https://drafts.csswg.org/cssom-1/#resolved-values">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+    html, .contents { display: contents }
+
+    #t2 .contents { background-color: green }
+    #t2 span { background-color: inherit }
+
+    #t3 .contents { color: green }
+
+    #t4 {
+        width: auto;
+        height: 50%;
+        margin-left: 25%;
+        padding-top: 10%;
+    }
+</style>
+<div id="t1" class="contents"></div>
+<div id="t2">
+    <div class="contents">
+        <span></span>
+    </div>
+</div>
+<div id="t3">
+    <div class="contents">
+        <span></span>
+    </div>
+</div>
+<div id="t4" class="contents"></div>
+<script>
+    test(function(){
+        assert_equals(getComputedStyle(document.querySelector("#t1")).display, "contents");
+    }, "Serialization of computed style value for display:contents");
+
+    test(function(){
+        assert_equals(getComputedStyle(document.querySelector("#t2 span")).backgroundColor, "rgb(0, 128, 0)");
+    }, "display:contents element as inherit parent - explicit inheritance");
+
+    test(function(){
+        assert_equals(getComputedStyle(document.querySelector("#t3 span")).color, "rgb(0, 128, 0)");
+    }, "display:contents element as inherit parent - implicit inheritance");
+
+    test(function(){
+        var computed = getComputedStyle(document.querySelector("#t4"));
+        assert_equals(computed.width, "auto");
+        assert_equals(computed.height, "50%");
+        assert_equals(computed.marginLeft, "25%");
+        assert_equals(computed.paddingTop, "10%");
+    }, "Resolved value should be computed value, not used value, for display:contents");
+
+    test(function(){
+        assert_equals(getComputedStyle(document.documentElement).display, "block");
+    }, "display:contents is blockified for root elements");
+</script>