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iframe-no-root-with-wrapping-scroller.html
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iframe-no-root-with-wrapping-scroller.html
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<!DOCTYPE html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/intersection-observer-test-utils.js"></script>
<style>
pre, #log {
position: absolute;
top: 0;
left: 200px;
}
.spacer {
height: calc(100vh + 100px);
}
iframe {
height: 100px;
width: 150px;
}
</style>
<div class="spacer"></div>
<div style="overflow: hidden">
<iframe id="target-iframe" src="resources/iframe-no-root-subframe.html"></iframe>
</div>
<div class="spacer"></div>
<script>
var vw = document.documentElement.clientWidth;
var vh = document.documentElement.clientHeight;
var iframe = document.getElementById("target-iframe");
var target;
var entries = [];
iframe.onload = function() {
runTestCycle(function() {
assert_true(!!iframe, "iframe exists");
target = iframe.contentDocument.getElementById("target");
assert_true(!!target, "Target element exists.");
var observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes)
});
observer.observe(target);
entries = entries.concat(observer.takeRecords());
assert_equals(entries.length, 0, "No initial notifications.");
runTestCycle(step0, "First rAF.");
}, "Observer with the implicit root; target in a same-origin iframe.");
};
function step0() {
document.scrollingElement.scrollTop = 200;
runTestCycle(step1, "document.scrollingElement.scrollTop = 200");
checkLastEntry(entries, 0, [8, 108, 208, 308, 0, 0, 0, 0, 0, vw, 0, vh, false]);
}
function step1() {
iframe.contentDocument.scrollingElement.scrollTop = 250;
runTestCycle(step2, "iframe.contentDocument.scrollingElement.scrollTop = 250");
assert_equals(entries.length, 1, "entries.length == 1");
}
function step2() {
document.scrollingElement.scrollTop = 100;
runTestCycle(step3, "document.scrollingElement.scrollTop = 100");
checkLastEntry(entries, 1, [8, 108, -42, 58, 8, 108, 0, 58, 0, vw, 0, vh, true]);
}
function step3() {
checkLastEntry(entries, 2, [8, 108, -42, 58, 0, 0, 0, 0, 0, vw, 0, vh, false]);
document.scrollingElement.scrollTop = 0;
}
</script>