45 lines
1.4 KiB
HTML
45 lines
1.4 KiB
HTML
<!doctype html>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<title>Scrollport is used rather than content rect to compute intersection ratio</title>
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<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
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<link rel="author" href="https://mozilla.org" title="Mozilla">
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<link rel="help" href="https://github.com/w3c/IntersectionObserver/issues/504">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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#root {
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overflow: hidden;
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position: relative;
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box-sizing: border-box;
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width: 100px;
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height: 100px;
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padding: 10px;
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}
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#target {
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width: 100px;
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height: 100px;
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background-color: green;
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/* Shift into the padding area */
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position: relative;
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left: -10px;
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top: -10px;
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}
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</style>
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<div id="root">
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<div id="target"></div>
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</div>
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<script>
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promise_test(async function(t) {
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const target = document.getElementById("target");
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assert_true(!!target, "target exists");
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const root = document.getElementById("root");
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assert_true(!!root, "root exists");
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const entries = await new Promise(resolve => {
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const observer = new IntersectionObserver(resolve, { root });
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observer.observe(target);
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});
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assert_equals(entries.length, 1, "Should have one entry.");
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assert_equals(entries[0].intersectionRatio, 1, "Should be completely visible.");
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});
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</script>
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