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diff --git a/layout/reftests/css-placeholder/css-restrictions.html b/layout/reftests/css-placeholder/css-restrictions.html
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+<!DOCTYPE html>
+<html>
+ <style>
+ :is(input, textarea)::placeholder {
+ visibility: hidden;
+ padding: 20px;
+ float: right;
+ overflow: visible;
+
+ /*
+ * This list could be endless given that all non-whitelisted properties
+ * are restricted.
+ */
+ }
+ </style>
+ <body>
+ <input placeholder='foo'>
+ <textarea placeholder='foo'></textarea>
+ <!-- for overflow and white-space -->
+ <input placeholder='this is a quitelongetextforasmallelement'>
+ <textarea placeholder='this is a quitelongetextforasmallelement'></textarea>
+ </body>
+</html>