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+<!DOCTYPE html>
+<html>
+ <head>
+ <meta charset="utf-8">
+ <title>CSS Masking: mask-origin: mask positioning area</title>
+ <link rel="author" title="Astley Chen" href="mailto:aschen@mozilla.com">
+ <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+ <link rel="help" href="https://www.w3.org/TR/css-masking-1/#the-mask-origin">
+ <link rel="match" href="mask-origin-1-ref.html">
+ <meta name="assert" content="Test checks whether setting mask position area works correctly or not.">
+ <style type="text/css">
+ div.outer {
+ border: 1px solid black;
+ width: 100px;
+ height: 100px;
+ }
+
+ div.inner {
+ /*
+ * content box: 60 x 60
+ * padding box: 72 x 78
+ * border box: 80 x 90
+ * margin box: 86 x 94
+ */
+ margin: 1px 2px 3px 4px;
+ border: solid transparent;
+ border-width: 8px 2px 4px 6px;
+ padding: 6px 9px 12px 3px;
+ width: 60px;
+ height: 60px;
+ background-color: purple;
+ mask-image: url(support/50x50-opaque-blue.svg);
+ mask-repeat: no-repeat;
+ mask-position: left top;
+ }
+
+ #border { mask-origin: border-box; }
+ #padding { mask-origin: padding-box; }
+ #content { mask-origin: content-box; }
+ </style>
+ </head>
+ <body>
+ <div class="outer"><div class="inner"></div></div>
+ <div class="outer"><div class="inner" id="border"></div></div>
+ <div class="outer"><div class="inner" id="padding"></div></div>
+ <div class="outer"><div class="inner" id="content"></div></div>
+ </body>
+</html>