<!doctype html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1198135 --> <html><head> <title>Test for Bug 1198135</title> <script src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" href="/tests/SimpleTest/test.css"> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1198135">Mozilla Bug 1198135</a> <style> .example { perspective: 100px; height: 300px; width: 300px; overflow-x: hidden; overflow-y: auto; border: 1px solid blue; } .example__group { position: relative; transform-style: preserve-3d; height: 300px; top: 0; } .example__layer { position: absolute; top:0; left: 0; right: 0; bottom: 0; } .layer--a { box-shadow: inset 0 0 0 1px red; } .layer--b { box-shadow: inset 0 0 0 1px blue; transform: translateZ(50px) scale(.45); } .layer--c { box-shadow: inset 0 0 0 1px green; } .layer--d { box-shadow: inset 00px 0 0px 1px orange; transform: translateZ(50px) scale(.45); } .layer--e { box-shadow: inset 00px 0 0px 1px orange; transform: translateZ(50px) scale(.45) translateY(300px); } </style> </head> <body> <div class="example" id="first"> <div class="example__group"> <div class="example__layer layer--a"></div> <div class="example__layer layer--b"></div> </div> <div class="example__group"> <div class="example__layer layer--c"></div> <div class="example__layer layer--d"></div> </div> </div> <div class="example" id="second"> <div class="example__group"> <div class="example__layer layer--a"></div> <div class="example__layer layer--b"></div> </div> <div class="example__group"> <div class="example__layer layer--c"></div> <div class="example__layer layer--e"></div> </div> </div> <script> is(document.getElementById("first").scrollHeight, 600, "Scroll height should be computed correctly"); document.getElementById("first").scrollTop = 150; is(document.getElementById("first").scrollHeight, 600, "Scroll height should be a constant when scrolling"); // The true height is 727.5 and we don't always snap the same direction. isfuzzy(document.getElementById("second").scrollHeight, 728, 1, "Scroll height should be computed correctly"); document.getElementById("second").scrollTop = 150; isfuzzy(document.getElementById("second").scrollHeight, 728, 1, "Scroll height should be a constant when scrolling"); </script> </body></html>