blob: 51010bb73b0bd48e6234e61893464b5f84cdc767 [file] [log] [blame]
<!DOCTYPE html>
<script src="../resources/js-test.js"></script>
<script src="helper-functions.js"></script>
<div style="width:100%; height:700px;"></div>
<div id="target" style="background-color: green; width:0px; height:0px"></div>
<div style="width:100%; height:700px;"></div>
<script>
description("Intersection observer test with zero-size target element.");
var target = document.getElementById("target");
var entries = [];
var observer = new IntersectionObserver(changes => { entries = entries.concat(changes) }, {});
onload = function() {
observer.observe(target);
entries.push(...observer.takeRecords());
shouldBeEqualToNumber("entries.length", 0);
document.scrollingElement.scrollTop = 300;
// See README for explanation of double RAF.
requestAnimationFrame(() => { requestAnimationFrame(step1) });
};
function step1() {
entries.push(...observer.takeRecords());
shouldBeEqualToNumber("entries.length", 1);
if (entries.length > 0) {
shouldBeEqualToNumber("entries[0].boundingClientRect.left", 8);
shouldBeEqualToNumber("entries[0].boundingClientRect.right", 8);
shouldBeEqualToNumber("entries[0].boundingClientRect.top", 408);
shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 408);
shouldBeEqualToNumber("entries[0].intersectionRect.left", 8);
shouldBeEqualToNumber("entries[0].intersectionRect.right", 8);
shouldBeEqualToNumber("entries[0].intersectionRect.top", 408);
shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 408);
shouldBeEqualToNumber("entries[0].rootBounds.left", 0);
shouldBeEqualToNumber("entries[0].rootBounds.right", 785);
shouldBeEqualToNumber("entries[0].rootBounds.top", 0);
shouldBeEqualToNumber("entries[0].rootBounds.bottom", 600);
shouldEvaluateToSameObject("entries[0].target", target);
// ClientRect members of IntersectionObserverEntry should be stable.
shouldEvaluateToSameObject("entries[0].boundingClientRect", entries[0].boundingClientRect);
shouldEvaluateToSameObject("entries[0].intersectionRect", entries[0].intersectionRect);
shouldEvaluateToSameObject("entries[0].rootBounds", entries[0].rootBounds);
}
document.scrollingElement.scrollTop = 100;
requestAnimationFrame(step2);
}
function step2() {
entries.push(...observer.takeRecords());
shouldBeEqualToNumber("entries.length", 2);
if (entries.length > 1) {
shouldBeEqualToNumber("entries[1].boundingClientRect.left", 8);
shouldBeEqualToNumber("entries[1].boundingClientRect.right", 8);
shouldBeEqualToNumber("entries[1].boundingClientRect.top", 608);
shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 608);
shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
shouldBeEqualToNumber("entries[1].rootBounds.left", 0);
shouldBeEqualToNumber("entries[1].rootBounds.right", 785);
shouldBeEqualToNumber("entries[1].rootBounds.top", 0);
shouldBeEqualToNumber("entries[1].rootBounds.bottom", 600);
shouldEvaluateToSameObject("entries[1].target", target);
}
finishJSTest();
document.scrollingElement.scrollTop = 0;
}
</script>