46 lines
1.5 KiB
HTML
46 lines
1.5 KiB
HTML
<!DOCTYPE html>
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link rel="help" href="https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-scrollmargin">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="./resources/intersection-observer-test-utils.js"></script>
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<iframe
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id="target-iframe"
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src="resources/iframe-no-root-subframe.html"
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width="300"
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height="200"
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></iframe>
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<script>
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var iframe = document.getElementById("target-iframe");
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var target;
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var entries = [];
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iframe.onload = function() {
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runTestCycle(function() {
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assert_true(!!iframe, "iframe exists");
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target = iframe.contentDocument.getElementById("target");
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assert_true(!!target, "Target element exists.");
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var observer = new IntersectionObserver(function(changes) {
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entries = entries.concat(changes)
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}, {
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scrollMargin: "18px"
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});
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observer.observe(target);
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entries = entries.concat(observer.takeRecords());
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assert_equals(entries.length, 0, "No initial notifications.");
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runTestCycle(testIntersection, "Test scroll margin intersection");
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}, "Observer with the implicit root; target in a same-origin iframe.");
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};
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function testIntersection() {
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assert_equals(entries.length, 1, "IntersectionObserverEntryCount");
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assert_true(entries[0].isIntersecting, "isIntersecting");
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assert_approx_equals(entries[0].intersectionRatio, 0.1, 0.001, "intersectionRatio");
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}
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</script>
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