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svg-group-target.html
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<!DOCTYPE html>
<title>IntersectionObserver observing an SVG <g> element</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>
<style>
.spacer {
height: calc(100vh + 100px);
}
</style>
<svg viewBox="0 0 200 100" width="400">
<g id="target">
<rect x="50" y="25" width="100" height="50" fill="blue"/>
</g>
</svg>
<script>
const viewportWidth = document.documentElement.clientWidth;
const viewportHeight = document.documentElement.clientHeight;
setup(() => {
window.entries = [];
window.target = document.getElementById("target");
window.targetRect = target.getBoundingClientRect();
window.rect = document.querySelector("#target > rect");
});
runTestCycle(function() {
assert_true(!!target, "target exists");
const 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.");
});
function step0() {
rect.style.transform = "translate(0, 150px)";
runTestCycle(step1, "descendant rect translated down by 150 units (out of SVG viewport)");
// The numbers in brackets are target client rect; intersection rect;
// and root bounds.
checkLastEntry(entries, 0, [
108, 108 + targetRect.width, 58, 58 + targetRect.height,
108, 108 + targetRect.width, 58, 58 + targetRect.height,
0, viewportWidth, 0, viewportHeight,
true,
]);
}
function step1() {
rect.style.transform = "translate(0, 50px)";
runTestCycle(step2, "descendant rect translated down by 100 units");
checkLastEntry(entries, 1, [
108, 108 + targetRect.width, 8 + (25 + 150) * 2, 8 + (25 + 150) * 2 + targetRect.height,
0, 0, 0, 0,
0, viewportWidth, 0, viewportHeight,
false,
]);
}
function step2() {
rect.style.transform = "";
checkLastEntry(entries, 2, [
108, 108 + targetRect.width, 8 + (25 + 50) * 2, 8 + (25 + 50) * 2 + targetRect.height,
108, 108 + targetRect.width, 8 + (25 + 50) * 2, 8 + (25 + 50) * 2 + targetRect.height / 2,
0, viewportWidth, 0, viewportHeight,
true,
]);
}
</script>