<!DOCTYPE html>
<title>IntersectionObserver observing an SVG <rect> element with changing 'transform'</title>
<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>
<svg id="container" width="10" height="10" viewBox="0 0 128 128" style="background: lightblue; position: absolute; top: 0; left: 0;">
<rect id="target" x="0" y="0" width="128" height="128" fill="green"></rect>
</svg>
<script>
const viewportWidth = document.documentElement.clientWidth;
const viewportHeight = document.documentElement.clientHeight;
setup(() => {
window.entries = [];
window.target = document.getElementById("target");
window.targetRect = target.getBoundingClientRect();
});
runTestCycle(function() {
assert_true(!!target, "target exists");
const observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes);
}, {root: container, threshold: [0, 0.5, 1]});
observer.observe(target);
entries = entries.concat(observer.takeRecords());
assert_equals(entries.length, 0, "No initial notifications");
runTestCycle(step0, "First rAF.");
});
function step0() {
target.setAttribute('y', '-64');
runTestCycle(step1, "change target's y property to -64)");
// The numbers in brackets are target client rect; intersection rect;
// and root bounds.
checkLastEntry(entries, 0, [
0, targetRect.width, 0, targetRect.height,
0, targetRect.width, 0, targetRect.height,
0, 10, 0, 10,
true,
]);
}
function step1() {
target.style.transform = "translate(0, 50px)";
checkLastEntry(entries, 1, [
0, targetRect.width, -5, -5 + targetRect.height,
0, targetRect.width, 0, -5 + targetRect.height,
0, 10, 0, 10,
true,
]);
}
</script>
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