<!DOCTYPE HTML> <html> <head> <title>Test bug 784410</title> <script src="/tests/SimpleTest/SimpleTest.js"></script> <script src="/tests/SimpleTest/EventUtils.js"></script> <script src="/tests/SimpleTest/paint_listener.js"></script> <script src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> </head> <body> <p id="display"></p> <div id="outer" style="overflow:auto; height:200px; border:2px dotted black; transform: translateY(1px)" onscroll="doneScroll()"> <div id="d" style="overflow:auto; height:102px;" onscroll="doneScroll()"> <div id="inner" style="height:100.1px; border:1px solid black; background:yellow;">Hello</div> </div> <div style="height:500px;"></div> </div> <pre id="test"> <script class="testbody" type="text/javascript"> var sel = window.getSelection(); var outer = document.getElementById("outer"); var d = document.getElementById("d"); var inner = document.getElementById("inner"); var smoothScrollPref = "general.smoothScroll"; function innerScrollOffset() { return inner.getBoundingClientRect().top - d.getBoundingClientRect().top; } var innerStartScrollOffset = innerScrollOffset(); var step = 0; var wheelAndPaintDone = false; async function doneScroll() { ++step; switch (step) { case 1: is(innerScrollOffset(), innerStartScrollOffset, "Inner element should not have scrolled down"); ok(outer.scrollTop > 0, "Outer element should have scrolled down"); outer.scrollTop = 0; break; case 2: // wait until APZ is ready to handle the wheel event, then send it await promiseApzFlushedRepaints(); // Wait for paints to flush, so APZ is notified of the new scroll offset. sendWheelAndPaint(inner, 4, 4, { deltaMode: WheelEvent.DOM_DELTA_LINE, deltaY: 1 }, function() { wheelAndPaintDone = true; doneTest(); }); break; case 3: is(innerScrollOffset(), innerStartScrollOffset, "Inner element should not have scrolled down"); ok(outer.scrollTop > 0, "Outer element should have scrolled down"); doneTest(); break; } } function doneTest() { // wait until wheelAndPaintDone has invoked its callback before we end the // test, otherwise we might get calls to advanceTimeAndRefresh after we // restore normal refresh, and that will screw up the next test. if (wheelAndPaintDone && step == 3) { SpecialPowers.DOMWindowUtils.restoreNormalRefresh(); SimpleTest.finish(); } } function test() { sel.collapse(inner.firstChild, 2); synthesizeKey("KEY_PageDown"); } SimpleTest.waitForExplicitFinish(); SimpleTest.waitForFocus(function() { SpecialPowers.pushPrefEnv({"set":[[smoothScrollPref, false], ["test.events.async.enabled", true]]}, test); }); </script> </pre> </body> </html>