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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>
body, html {
margin: 0;
}
pre, #log {
position: absolute;
top: 0;
left: 200px;
}
iframe {
width: 100px;
height: 100px;
border: 0;
}
#text-shadow {
display: inline-block;
font-size: 144px;
font-weight: 1000;
color: rgba(0, 0, 0, 0);
text-shadow: -100px 0 0 rgba(255, 0, 0, .7);
}
</style>
<iframe id=target srcdoc="<!DOCTYPE html><div>Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum.</div>"></iframe><div id=text-shadow>O</div>
<script>
var delay = 100;
var entries = [];
var target;
var occluder;
runTestCycle(function() {
target = document.getElementById("target");
occluder = document.getElementById("text-shadow");
assert_true(!!target, "target exists");
assert_true(!!occluder, "occluder exists");
let observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes)
}, {trackVisibility: true, delay: delay});
observer.observe(target);
entries = entries.concat(observer.takeRecords());
assert_equals(entries.length, 0, "No initial notifications.");
runTestCycle(step0, "First rAF.", delay);
}, "IntersectionObserverV2 observing an iframe element.", delay);
function step0() {
occluder.style.textShadow = "none";
runTestCycle(step1, 'occluder.style.textShadow = "none"', delay);
assert_equals(entries.length, 1, "Initial notification.");
assert_equals(entries[0].isVisible, false, "Initially occluded.");
}
function step1() {
occluder.style.textShadow = "";
runTestCycle(step2, 'occluder.style.textShadow = ""', delay);
assert_equals(entries.length, 2, "Notification after removing text shadow.");
assert_equals(entries[1].isVisible, true, "Visible when text shadow removed.");
}
function step2() {
assert_equals(entries.length, 3, "Notification after re-adding text shadow.");
assert_equals(entries[2].isVisible, false, "Occluded when text shadow re-added.");
}
</script>
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