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-rw-r--r--layout/reftests/bugs/552334-1.html26
1 files changed, 26 insertions, 0 deletions
diff --git a/layout/reftests/bugs/552334-1.html b/layout/reftests/bugs/552334-1.html
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+++ b/layout/reftests/bugs/552334-1.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+ <head>
+ <style>
+ div { position: absolute; top: 0; left: 0; width: 100px; height: 100px; }
+ div.offset { left: 100px; }
+ div.offset2 { left: 200px; }
+ </style>
+ </head>
+ <body>
+ <!-- Make sure the difference of the two z-index values overflows a 32-bit
+ signed int. So set the positive one to 2^30 + 1 and the negative one to
+ -(2^30 + 1). Then the difference is 2^31 + 2 which is negative when
+ treated as a 32-bit signed int. -->
+ <div style="background: green; z-index: 1073741825"></div>
+ <div style="background: red; z-index: -1073741825"></div>
+ <!-- Test clamping on the high end by setting the high z-index to
+ 2^32 + 1 -->
+ <div class="offset" style="background: green; z-index: 4294967297"></div>
+ <div class="offset" style="background: red; z-index: 2"></div>
+ <!-- Test clamping on the low end by setting the low z-index to
+ -(2^32 + 1) -->
+ <div class="offset2" style="background: green; z-index: -2"></div>
+ <div class="offset2" style="background: red; z-index: -4294967297"></div>
+ </body>
+</html>