wpt/css/css-scroll-anchoring/position-change-heuristic-in-nested-scroll-box.html at master · web-platform-tests/wpt · GitHub

Name: wpt/css/css-scroll-anchoring/position-change-heuristic-in-nested-scroll-box.html at master · web-platform-tests/wpt · GitHub
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<!DOCTYPE html>
<scriptsrc="/resources/testharness.js"></script>
<scriptsrc="/resources/testharnessreport.js"></script>
<linkrel="help" href="https://drafts.csswg.org/css-scroll-anchoring/#suppression-triggers">
<style>
#space {
height:4000px;
overflow: hidden;
}
#header {
background-color:#F5B335;
height:50px;
width:100%;
}
#content {
background-color:#D3D3D3;
height:400px;
}
.scroller {
overflow: scroll;
position: relative;
width:600px;
height:600px;
}
body {
overflow: hidden;
}
</style>
<divid="maybeScroller">
<divid="space">
<divid="header"></div>
<divid="before"></div>
<divid="content"></div>
</div>
</div>
<script>

// Tests that scroll anchoring is suppressed when an element in the scroller
// changes its in-flow state.

varscroller;

functionrunCase(oldPos,newPos,expectSuppression,skipInverse){
varheader=document.querySelector("#header");
varbefore=document.querySelector("#before");

header.style.position=oldPos;
before.style.height="0";
scroller.scrollTop=200;

header.style.position=newPos;
before.style.height="25px";

varexpectedTop=expectSuppression ? 200 : 225;
assert_equals(scroller.scrollTop,expectedTop);

if(!skipInverse)
runCase(newPos,oldPos,expectSuppression,true);
}

test(()=>{
scroller=document.scrollingElement;
document.querySelector("#maybeScroller").className="";

runCase("static","fixed",true);
runCase("static","absolute",true);
runCase("static","relative",false);
runCase("fixed","absolute",false);
runCase("fixed","relative",true);
runCase("absolute","relative",true);
},"Position changes in document scroller.");

test(()=>{
scroller=document.querySelector("#maybeScroller");
scroller.className="scroller";

runCase("static","fixed",true);
runCase("static","absolute",true);
runCase("static","relative",false);
runCase("fixed","absolute",false);
runCase("fixed","relative",true);
runCase("absolute","relative",true);
},"Position changes in scrollable <div>.");

</script>