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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
| commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
| tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /layout/style/test/test_bug1490890.html | |
| parent | Initial commit. (diff) | |
| download | firefox-upstream.tar.xz firefox-upstream.zip | |
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'layout/style/test/test_bug1490890.html')
| -rw-r--r-- | layout/style/test/test_bug1490890.html | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/layout/style/test/test_bug1490890.html b/layout/style/test/test_bug1490890.html new file mode 100644 index 0000000000..00a8176ed6 --- /dev/null +++ b/layout/style/test/test_bug1490890.html @@ -0,0 +1,112 @@ +<!DOCTYPE HTML> +<html> +<!-- +https://bugzilla.mozilla.org/show_bug.cgi?id=1490890 +--> +<head> + <meta charset="utf-8"> + <title>Test for Bug 1490890</title> + <script src="/tests/SimpleTest/SimpleTest.js"></script> + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> + <style> + #flex { + display: flex; + flex-direction: column; + height: 100px; + max-height: 100px; + overflow: hidden; + border: 1px solid black; + } + #overflowAuto { + overflow: auto; + white-space: pre-wrap; + } + </style> +</head> +<body> +<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1490890">Mozilla Bug 1490890</a> +<div id="display"> + <div id="content"> + <div id="flex"> + <div id="overflowAuto"> + <!-- Populated by test JS below: --> + <div id="tall"></div> + </div> + <div id="testNode">abc</div> + </div> + </div> +</div> +<pre id="test"> +<script type="application/javascript"> +"use strict"; + +/** Test for Bug 1490890 **/ + +/** + * This test checks how many reflows are required, when we make a change inside + * a flex item, with a tall scrollable sibling flex item. + */ + +const gUtils = SpecialPowers.getDOMWindowUtils(window); + +// The elements that we will modify here: +const gTall = document.getElementById("tall"); +const gTestNode = document.getElementById("testNode"); + +// Helper function to undo our modifications: +function cleanup() +{ + gTall.firstChild.remove(); + gTestNode.style = ""; +} + +// Flush layout & return the global frame-reflow-count +function getReflowCount() +{ + let unusedVal = document.getElementById("flex").offsetHeight; // flush layout + return gUtils.framesReflowed; +} + +// This function changes gTestNode to "display:none", and returns the number +// of frames that need to be reflowed as a result of that tweak. +function makeTweakAndCountReflows() +{ + let beforeCount = getReflowCount(); + gTestNode.style.display = "none"; + let afterCount = getReflowCount(); + + let numReflows = afterCount - beforeCount; + if (numReflows <= 0) { + ok(false, "something's wrong -- we should've reflowed *something*"); + } + return numReflows; +} + +// ACTUAL TEST LOGIC STARTS HERE +// ----------------------------- +const testLineCount = 100; +const refLineCount = 5000; + +// "Reference" measurement: put enough lines of text into gTall to trigger +// a vertical scrollbar, and then see how many frames need to be reflowed +// in response to a tweak in gTestNode: +let text = document.createTextNode("a\n".repeat(testLineCount)); +gTall.appendChild(text); +let numReferenceReflows = makeTweakAndCountReflows(); +cleanup(); + +// "Test" measurement: put many more lines of text into gTall (many more than +// for reference case), and then see how many frames need to be reflowed +// in response to a tweak in gTestNode: +text = document.createTextNode("a\n".repeat(refLineCount)); +gTall.appendChild(text); +let numTestReflows = makeTweakAndCountReflows(); +cleanup(); + +is(numTestReflows, numReferenceReflows, + "Tweak should trigger the same number of reflows regardless of " + + "how much content is present in descendant of sibling"); +</script> +</pre> +</body> +</html> |