Add a reference for Acid2 that should pixel-for-pixel match

Per https://bugzilla.mozilla.org/show_bug.cgi?id=343583#c6, Hixie never intended the reference.png to match exactly (e.g., the nose especially is quite fragile with anti-aliasing differences). This is based on the test itself, but by and large just uses block layout with pretty simple border/backgrounds. The only complexity is in the eyes (where layering is needed to get the background interpolated as on the test) and the nose (which mostly matches the test as browsers trivially differ around the aliasing of border edges).
Tobias710219 · Mar 7, 2019 · 42330b2 · 42330b2
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diff --git a/acid/acid2/px-reference.html b/acid/acid2/px-reference.html
@@ -0,0 +1,272 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<html>
+ <head>
+  <title>The Second Acid Test (pixel-for-pixel reference version)</title>
+  <style type="text/css">
+    *
+    {
+        margin: 0;
+        padding: 0;
+    }
+
+    html
+    {
+        font: 12px sans-serif;
+
+        overflow: hidden;
+
+        color: red;
+        background: white;
+    }
+
+    #top
+    {
+        font: 2em / 24px sans-serif;
+
+        margin: 2em 3.5em 0;
+
+        text-align: left;
+        white-space: pre;
+
+        color: navy;
+    }
+
+    .picture
+    {
+        margin: 3em 1em 1em 6em;
+    }
+
+    .line
+    {
+        height: 1em;
+
+        border: 0 solid black;
+        background: yellow;
+    }
+
+    .one
+    {
+        width: 0;
+        margin-left: 5em;
+
+        border-width: 0 2em;
+    }
+
+    .two
+    {
+        width: 4em;
+        margin-left: 3em;
+
+        border-width: 0 2em;
+    }
+
+    .three
+    {
+        width: 8em;
+        margin-left: 2em;
+
+        border-width: 0 1em;
+    }
+
+    /* the eyes, in all their three-layer glory
+
+       these need to appear with both background layers as on hidpi displays
+       the two background layers don't just create a solid yellow background */
+    .eyes
+    {
+        position: relative;
+
+        width: 12em;
+        height: 2em;
+        margin-left: 1em;
+
+        background: red;
+    }
+
+    .eyes .lower
+    {
+        position: absolute;
+        z-index: 1; /* redundant, but make stacking explicit */
+
+        width: 9em;
+        height: 2em;
+        margin-left: 1em;
+
+        border-left: solid 1em yellow;
+        background: fixed url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAABnRSTlMAAAAAAABupgeRAAAABmJLR0QA%2FwD%2FAP%2BgvaeTAAAAEUlEQVR42mP4%2F58BCv7%2FZwAAHfAD%2FabwPj4AAAAASUVORK5CYII%3D');
+    }
+
+    .eyes .upper
+    {
+        position: absolute;
+        z-index: 2; /* redundant, but make stacking explicit */
+
+        width: 10em;
+        height: 2em;
+        margin-left: 0;
+
+        border: solid 1em black;
+        border-width: 0 1em;
+        background: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAABnRSTlMAAAAAAABupgeRAAAABmJLR0QA%2FwD%2FAP%2BgvaeTAAAAEUlEQVR42mP4%2F58BCv7%2FZwAAHfAD%2FabwPj4AAAAASUVORK5CYII%3D') fixed 1px 0;
+    }
+
+    .eyes .img
+    {
+        position: absolute;
+        z-index: 3; /* redundant, but make stacking explicit */
+
+        width: 8em;
+        height: 2em;
+        margin-left: 2em;
+
+        background: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAAAYCAYAAAFy7sgCAAAGsUlEQVRo3u2ZbWwcZxHHf3s%2B7LNbO3ZjXBtowprGODRX0qpNQCjmJKuVKhMl1P2AkCwhFOIKkCBSm9IXavGFKAixIAECwkmWo5MrhRI3Ub40IEwQgp6aIDg3Cd6eEqyIHEteah%2B1E69vhw%2BZtTaX8704ZzkKjHS6271nZ56ZZ%2BY%2F%2F%2BdZKF%2FCwYshx3EkkggLsD1v4FQkEZZYLCbAKyG9%2Ba9EIsG6hnUAf8x74K3aUC3j4%2BM54HcsR2oAIomwZOezkv%2FnSHpYNh%2BNCmAE7xv94zvFdd1bHsjMZmQkPSxAJP%2B%2FfuBLwK54PC7JZFKAVJmzXLBt2w%2FMvcDLwIb8QS8CeJ4nkURYIomw7J%2FYJ8BvSiiXptGGxWds2%2Fa9%2Bnaxh%2BYAD%2Bgt04NDgABTpQY2cvvSFLzw86gWeBVwC8SzlOSv2YeBPfmDBoBHgKmR9LBEEmHZfDTqGykqfkUE0nA78BzQGfSgUeP3wNeTXwXg7MwZDhw4UHL6ra2ti79%2FOvljgG8AZ4H64Lhm4MvAocxsRppGG%2FxcXihlwLIs6R%2FfKV2HO%2F26uA94pdDYUKUZUU7W1RQYXA98Gnhaf5%2FXWX0HeAHYoQonqa4sZSOsSWMCWeC9Yko%2BCQwBe4E6oNc0Tc91XTl1%2BaTsn9gnI%2Blhyc5nZWxsrBIkKSbl2tiic3tW53YDEwOKaoFBrcOfqKee53lG9xsPMjV784r%2F4lO%2FpPvyJ9iyZcuvFSaXK5XYeAZ4CDgGvB3MS4B54LQuWYPeuy4iRFsevsXqpuYoqVQKIH2bK1CuDQNo11o4XUzh%2FcDWYIe1LEtyuZx4niee54njOGKapgfsqlL%2Bl2OjEXg8nxrc1dJ0h3hbtL%2BGCtz7KPBF4CuBe9uB15VafE8hr9qylI3HgG8C2%2FK7VyHZoJj7MrBRm30qFotJMpkU27YlHo%2F7Ha5a%2BV%2FKRkSJ4KuKRLVLKapTjB1SzAVIjY2NSXY%2BKyPpYdk%2FsU9OXT4pruv6BdZbBQfKsVGnvWlIe1VB6VQO8JxC1vZYLCbZ%2BaxsPhpdZDyRRFhG0sPiOE6ldKBg2lRg4xF1YCDIIIKN7DGgD3gH%2BBXwejKZfPrs2tPs%2FvPN2bKuYR1nd7xLKBSSJeqoXKnERjPwNWAG%2BLn2rZuM%2B4Tpml6vaWlp4eLcxVusZq5lCgVgOVKJjRqdX86ffL4D5wIoZACnTpw4wRMdT96i%2FImOJxERAs4uVyqxUacF%2FPdiCj%2BjdRBRGFtwXVdG0sPSdbhTmkYbpH98p2RmM2JZlig1vl0GWo4NQ%2Fn%2Bs5pKRXfwjweaxy7TND3HcRZbfC6X8xVPVQlGy7WxVWlO5XRXFXm6EZmrQuSXYyPE3SiVoEhE6Wyr0u2rumO6zv%2B21AFdQAswC1wCMuUCXCmyWQus103Qg8qlDO0lxwOb%2Fl4FiK3AB3VS%2FuKKLtK%2FgbeAnwG%2FvUODuRw%2FFrR0H1UC75fwu8oJ%2FhFsW5VIG%2FBUgEIN6Y65O4AHu4Ap0zQ9y7LEcZyb9lRBUHQcRyzL8unZVBW5bFWAvAp%2BhDQ2g4F47dUYtlU6obXA54DnVdFLekjUGGifh4AFy7LEdV3xj3X9I66m0QZpGm2QrsOd0j%2B%2BU0bSw5KZzYjrun6HWlAd961i4FfCj0aN1Usau%2Bc1lmuXPFwvAEumUut7tQQvAb%2FXb%2FT0bCAej9cODg7yt%2Bm%2F8q2%2F7OUHZ76PnZ1k2p0mJzlykmPancbOTnL0whHs7CQfb%2B5mx2d3sH79%2BtCRI0c6FeaOr9ICrIQfLvA%2B8BGNXxi4R6HrisJVUWrxAVW2oMFf0Aczim8o3kV6enowDIPjF9%2Fk%2BMU3S3rrjzMMg56eHr%2BxP7qKFbASfojG6kpeDGs1tiW53RxwWT%2Bin5q8w4xpQK5evQpAR30H7ZH2khNvj7TTUd8BgD4rqmu1ZKX8qNeY%2BfHz4zlXDgT5E8tpCTUq7XSBC4Euv8227TV9fX1E73%2BYtvo27BmbS9cvFVTY3bSRFza9yOcf6Gfmygy7d%2B%2Fm%2FPnzF4DvrsBLhnJlJfwIKXxv1PheAE4qK6p4H9AGbNKTuhngBPBPXYRe4IemaT5kWZbR19fHNbmGnZ1k4r3U4glDR30Hm5qjbGjsImJEOHbsGHv27JFz5869o0eFq01Jq%2BmHAXwI6FFKagMTgHM7GzFDS%2BoeLSMv7zjzC9x4Y7gxFovVDAwMEI1GaWlpWSzRVCrFwYMH%2FXfxZ4AfAa8B%2F7lDaGg1%2FQgp43lfK0yqtRMuJa3ceKe5DfgYsCYAZ2ngD8CfAkzqTpW7xY%2F%2FSznyX%2FVeUb2kVmX4AAAAAElFTkSuQmCC');
+    }
+
+    /* lines six to nine are the nose
+
+       (note these are scarcely changed from the test as border anti-aliasing
+       quickly differs) */
+    .nose
+    {
+        width: 12em;
+        height: 4em;
+        margin-left: 0;
+
+        border-width: 0 1em;
+    }
+
+    .nose > div
+    {
+        height: 0;
+        padding: 1em 1em 3em;
+
+        background: yellow;
+    }
+
+    .nose div div
+    {
+        width: 2em;
+        height: 2em;
+        margin-left: 4em;
+
+        background: red;
+    }
+
+    .nose div:hover div:before
+    {
+        border-bottom-color: blue;
+    }
+
+    .nose div:hover div:after
+    {
+        border-top-color: blue;
+    }
+
+    .nose div div:before
+    {
+        display: block;
+
+        height: 0;
+
+        content: '';
+
+        border-width: 1em;
+        border-style: none solid  solid;
+        border-color: red yellow black yellow;
+    }
+
+    .nose div div:after
+    {
+        display: block;
+
+        height: 0;
+
+        content: '';
+
+        border-width: 1em;
+        border-style: solid solid  none;
+        border-color: black yellow red yellow;
+    }
+
+    /* lines ten and eleven are the smile */
+    .ten
+    {
+        width: 10em;
+        margin-left: 1em;
+
+        border-width: 0 1em;
+    }
+
+    .ten div
+    {
+        width: 6em;
+        height: 1em;
+        margin-left: 1em;
+
+        border: solid black;
+        border-width: 0 1em;
+        background: transparent;
+    }
+
+    .eleven
+    {
+        width: 10em;
+        margin-left: 1em;
+
+        border-width: 0 1em;
+    }
+
+    .eleven div
+    {
+        width: 6em;
+        height: 1em;
+        margin-left: 2em;
+
+        background: black;
+    }
+
+    /* bottom of the face */
+    .twelve
+    {
+        width: 8em;
+        margin-left: 2em;
+
+        border-width: 0 1em;
+    }
+
+    .thirteen
+    {
+        width: 4em;
+        margin-left: 3em;
+
+        border-width: 0 2em;
+    }
+
+    .fourteen
+    {
+        width: 0;
+        margin-left: 5em;
+
+        border-width: 0 2em;
+    }
+  </style>
+ </head>
+ <body>
+  <h2 id="top">Hello World!</h2>
+  <div class="picture">
+   <div class="line one"></div>
+   <div class="line two"></div>
+   <div class="line three"></div>
+
+   <div class="eyes"><div class=lower></div><div class=upper></div><div class=img></div></div>
+
+   <div class="line nose"><div><div></div></div></div>
+
+   <div class="line ten"><div></div></div>
+   <div class="line eleven"><div></div></div>
+   <div class="line twelve"></div>
+   <div class="line thirteen"></div>
+   <div class="line fourteen"></div>
+  </div>
+ </body>
+</html>
diff --git a/acid/acid2/reftest.html b/acid/acid2/reftest.html
@@ -1,7 +1,7 @@
 <!doctype html>
 <html class=reftest-wait>
 <title>Acid2 reftest</title>
-<link rel="match" href="reference.html">
+<link rel="match" href="px-reference.html">
 <script src="/common/reftest-wait.js"></script>
 <style>
 * {