зеркало из https://github.com/mozilla/gecko-dev.git
61 строка
1.4 KiB
HTML
61 строка
1.4 KiB
HTML
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<!doctype html>
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<title>Test for bug 1526609</title>
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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<script src="/tests/SimpleTest/EventUtils.js"></script>
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<style>
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body {
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margin: 0;
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}
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.scroller {
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overflow-y: auto;
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position: relative;
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width: 500px;
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height: 300px;
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}
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.kid {
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position: absolute;
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width: 100%;
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background: linear-gradient(to bottom, red, green);
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line-height: 100px;
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}
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</style>
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<div class="scroller" id="scroller">
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<div class="kid"></div>
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</div>
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<script>
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{
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let text = " foo bar ";
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for (let i = 0; i < 16; ++i)
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text = text + text;
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document.querySelector(".kid").innerText = text;
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}
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SimpleTest.waitForExplicitFinish();
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const scroller = document.querySelector("#scroller");
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is(scroller.scrollTop, 0, "Initial scroll position");
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ok(scroller.scrollTopMax > 0, "Should be able to scroll down");
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scroller.scrollTop = scroller.scrollTopMax;
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is(scroller.scrollTop, scroller.scrollTopMax, "Should've scrolled");
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const origWidth = scroller.offsetWidth;
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const utils = SpecialPowers.DOMWindowUtils;
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// Take control of the refresh driver
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utils.advanceTimeAndRefresh(0);
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// Force the next reflow to get interrupted
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utils.forceReflowInterrupt();
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scroller.style.width = "300px";
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utils.advanceTimeAndRefresh(0);
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isnot(scroller.scrollTop, 0, "Shouldn't have lost scroll position");
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isnot(scroller.offsetWidth, origWidth, "Should've had to reflow");
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utils.restoreNormalRefresh();
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SimpleTest.finish();
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</script>
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