62 lines
1.8 KiB
HTML
62 lines
1.8 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=1151421
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-->
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<head>
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<title>Test for Bug 1151421</title>
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<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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</head>
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<body>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1151421">Mozilla Bug 1151421</a>
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<script type="application/javascript">
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/** Test for Bug 1151421 **/
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SimpleTest.waitForExplicitFinish();
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function childLoad() {
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// Spin the event loop so we leave the onload handler.
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SimpleTest.executeSoon(childLoad2);
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}
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function childLoad2() {
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let cw = iframe.contentWindow;
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let content = cw.document.getElementById("content");
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// Create a function to calculate an invariant.
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let topPlusOffset = function()
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{
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return Math.round(content.getBoundingClientRect().top + cw.pageYOffset);
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}
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let initialTPO = topPlusOffset();
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// Scroll the iframe to various positions, and check the TPO.
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// Scrolling down to the bottom will adjust the page offset by a fractional amount.
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let positions = [-100, 0.17, 0, 1.5, 10.41, 1e6, 12.1];
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// Run some tests with scrollTo() and ensure we have the same invariant after scrolling.
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positions.forEach(function(pos) {
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cw.scrollTo(0, pos);
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is(topPlusOffset(), initialTPO, "Top plus offset should remain invariant across scrolling.");
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});
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positions.reverse().forEach(function(pos) {
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cw.scrollTo(0, pos);
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is(topPlusOffset(), initialTPO, "(reverse) Top plus offset should remain invariant across scrolling.");
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});
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SimpleTest.finish();
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}
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</script>
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<!-- When the iframe loads, it calls childLoad(). -->
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<br>
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<iframe height='100px' id='iframe' src='file_bug1151421.html'></iframe>
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</body>
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</html>
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