diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
| commit | 2aa4a82499d4becd2284cdb482213d541b8804dd (patch) | |
| tree | b80bf8bf13c3766139fbacc530efd0dd9d54394c /layout/style/test/test_bug1505254.html | |
| parent | Initial commit. (diff) | |
| download | firefox-upstream.tar.xz firefox-upstream.zip | |
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'layout/style/test/test_bug1505254.html')
| -rw-r--r-- | layout/style/test/test_bug1505254.html | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/layout/style/test/test_bug1505254.html b/layout/style/test/test_bug1505254.html new file mode 100644 index 0000000000..9cb3d1e316 --- /dev/null +++ b/layout/style/test/test_bug1505254.html @@ -0,0 +1,152 @@ +<!DOCTYPE HTML> +<html> +<!-- +https://bugzilla.mozilla.org/show_bug.cgi?id=1505254 +--> +<head> + <meta charset="utf-8"> + <title>Test for Bug 1505254</title> + <script src="/tests/SimpleTest/SimpleTest.js"></script> + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> + <style> + /* Note: this CSS/DOM structure is loosely based on WhatsApp Web. */ + #outerFlex { + display: flex; + height: 200px; + border: 3px solid purple; + overflow: hidden; + position: relative; + } + #outerItem { + flex: 0 0 60%; + overflow: hidden; + position: relative; + } + #abspos { + position: absolute; + display: flex; + flex-direction: column; + height: 100%; + width: 100%; + } + #insideAbspos { + position: relative; + flex: 1 1 0; + width: 100%; + height: 100%; + } + #scroller { + display: flex; + flex-direction: column; + position: absolute; + top: 0; + overflow-x: hidden; + overflow-y: scroll; + height: 100%; + width: 100%; + } + #initiallyHidden { + display:none; + } + + </style> +</head> +<body> +<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1505254">Mozilla Bug 1505254</a> +<div id="display"> + <div id="content"> + <div id="outerFlex"> + <div id="outerItem"> + <div id="abspos"> + <div id="insideAbspos"> + <div> + <div id="scroller"> + <div style="min-height: 600px">abc</div> + <div id="initiallyHidden">def</div> + </div> + </div> + </div> + <div id="testNode"></div> + </div> + </div> + </div> + </div> +</div> +<pre id="test"> +<script type="application/javascript"> +"use strict"; + +/** Test for Bug 1505254 **/ + +/** + * This test checks how many reflows are required when we make a change inside + * of an abpsos element, which itself is inside of a flex item with cached + * block-size measurements. This test is checking that this sort of change + * doesn't invalidate those cached block-size measurements on the flex item + * ancestor. (We're testing that indirectly by seeing how many frames are + * reflowed.) + */ + +const gUtils = SpecialPowers.getDOMWindowUtils(window); + +// The elements that we will modify here: +const gInitiallyHidden = document.getElementById("initiallyHidden"); +const gTestNode = document.getElementById("testNode"); + +// Helper function to undo our modifications: +function cleanup() +{ + gTestNode.textContent = ""; + gInitiallyHidden.style = ""; +} + +// Helper function to flush layout & return the global frame-reflow-count: +function getReflowCount() +{ + let unusedVal = document.getElementById("scroller").offsetHeight; // flush layout + return gUtils.framesReflowed; +} + +// This function adds some text in gTestNode and returns the number of frames +// that need to be reflowed as a result of that tweak: +function makeTweakAndCountReflows() +{ + let beforeCount = getReflowCount(); + gTestNode.textContent = "def"; + 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 +// ----------------------------- + +// "Reference" measurement: see how many frames need to be reflowed +// in response to a tweak in gTestNode, before we've shown +// #initiallyHidden: +let numReferenceReflows = makeTweakAndCountReflows(); +cleanup(); + +// "Test" measurement: see how many frames need to be reflowed +// in response to a tweak in gTestNode, after we've shown #initiallyHidden: +gInitiallyHidden.style.display = "block"; +let numTestReflows = makeTweakAndCountReflows(); +cleanup(); + +// Any difference between our measurements is an indication that we're reflowing +// frames in a non-"dirty" subtree. (The gTestNode tweak has no reason to cause +// #initiallyHidden to be dirty -- and therefore, the presence/absence of +// #initiallyHidden shouldn't affect the number of frames that get reflowed in +// response to the gTestNode tweak). +is(numTestReflows, numReferenceReflows, + "Tweak should trigger the same number of reflows regardless of " + + "content in unmodified sibling"); + +</script> +</pre> +</body> +</html> |