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diff --git a/testing/web-platform/tests/css/css-borders/subpixel-borders-with-child-border-box-sizing.html b/testing/web-platform/tests/css/css-borders/subpixel-borders-with-child-border-box-sizing.html
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+++ b/testing/web-platform/tests/css/css-borders/subpixel-borders-with-child-border-box-sizing.html
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+<!DOCTYPE html>
+<link rel="author" title="Stephen Chenney" href="mailto:schenney@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#border-width">
+<link rel="match" href="reference/subpixel-borders-with-child-border-box-sizing-ref.html">
+<meta name="assert" content="Sub-pixel borders should always appear, and not be
+ overdrawn by child content with box-sizing: border-box." />
+<head>
+ <style>
+ body { }
+ .outer {
+ border: solid .5px black;
+ background: red;
+ width: 101px;
+ height: 101px;
+ margin: 5px;
+ padding: 0px;
+ box-sizing: border-box;
+ }
+ .inner {
+ background: lightgreen;
+ padding: 0px;
+ box-sizing: border-box;
+ }
+ #inner1 {
+ width: 99px;
+ height: 99px;
+ }
+ #inner2 {
+ width: 100%;
+ height: 100%;
+ }
+ </style>
+</head>
+<body>
+ <div class="outer">
+ <div class="inner" id="inner1"></div>
+ </div>
+
+ <div class="outer">
+ <div class="inner" id="inner2"></div>
+ </div>
+</body>