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diff --git a/layout/reftests/forms/input/file/css-display.html b/layout/reftests/forms/input/file/css-display.html
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+++ b/layout/reftests/forms/input/file/css-display.html
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+<!doctype html>
+<meta charset="utf-8">
+<title>Test: File input with CSS display</title>
+<link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#widgets">
+<link rel="help" href="https://github.com/whatwg/html/issues/4082">
+<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#propdef-overflow">
+<link rel="match" href="css-overflow-ref.html">
+<style>
+input {
+  height: 3em;
+}
+.inline       { display: inline }
+.inline-grid  { display: inline-grid; grid: 500px/500px; align-items: end; }
+.inline-flex  { display: inline-flex; flex-flow: column; align-items: end; }
+.inline-block { display: inline-block }
+.inline-table { display: inline-table }
+.inline-columns { display: inline-block; column-width: 500px; column-rule: 10px solid; }
+.grid  { display: grid; grid: 500px/500px; align-items: end; }
+.flex  { display: flex; flex-flow: column; align-items: end; }
+.block { display: block }
+.table { display: table }
+.columns { display: block; column-width: 500px; column-rule: 10px solid; }
+.n { -webkit-appearance:none; appearance:none; }
+</style>
+<body>
+  <input type="file" class="grid">
+  <input type="file" class="flex">
+  <input type="file" class="block">
+  <input type="file" class="table">
+  <input type="file" class="columns">
+
+  A<input type="file">
+  <input type="file" class="inline">
+  <input type="file" class="inline-grid">
+  <input type="file" class="inline-flex">
+  <input type="file" class="inline-block">
+  <input type="file" class="inline-table">
+  <input type="file" class="inline-columns">
+
+  A<input disabled type="file">
+  <input disabled type="file" class="inline">
+  <input disabled type="file" class="inline-grid">
+  <input disabled type="file" class="inline-flex">
+  <input disabled type="file" class="inline-block">
+  <input disabled type="file" class="inline-table">
+  <input disabled type="file" class="inline-columns">
+
+  A<input type="file" class="n">
+  <input type="file" class="n inline">
+  <input type="file" class="n inline-grid">
+  <input type="file" class="n inline-flex">
+  <input type="file" class="n inline-block">
+  <input type="file" class="n inline-table">
+  <input type="file" class="n inline-columns">
+
+  A<input disabled type="file" class="n">
+  <input disabled type="file" class="n inline">
+  <input disabled type="file" class="n inline-grid">
+  <input disabled type="file" class="n inline-flex">
+  <input disabled type="file" class="n inline-block">
+  <input disabled type="file" class="n inline-table">
+  <input disabled type="file" class="n inline-columns">
+</body>