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<!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("Iintersection observer test with zero-size target element.");
var target = document.getElementById("target");
var entries = [];
observer_callback = function(changes) {
for (var i in changes)
entries.push(changes[i]);
};
var observer = new IntersectionObserver(observer_callback, {});
observer.observe(target);
onload = function() {
shouldBeEqualToNumber("entries.length", 0);
document.scrollingElement.scrollTop = 300;
requestAnimationFrame(step1);
};
function step1() {
setTimeout(function() {
shouldBeEqualToNumber("entries.length", 1);
shouldBeEqualToNumber("entries[0].boundingClientRect.left", 8);
shouldBeEqualToNumber("entries[0].boundingClientRect.right", 9);
shouldBeEqualToNumber("entries[0].boundingClientRect.top", 408);
shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 409);
shouldBeEqualToNumber("entries[0].intersectionRect.left", 8);
shouldBeEqualToNumber("entries[0].intersectionRect.right", 9);
shouldBeEqualToNumber("entries[0].intersectionRect.top", 408);
shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 409);
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() {
setTimeout(function() {
shouldBeEqualToNumber("entries.length", 2);
shouldBeEqualToNumber("entries[1].boundingClientRect.left", 8);
shouldBeEqualToNumber("entries[1].boundingClientRect.right", 9);
shouldBeEqualToNumber("entries[1].boundingClientRect.top", 608);
shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 609);
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>
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