1 files changed, 97 insertions, 0 deletions
diff --git a/testing/web-platform/tests/intersection-observer/multiple-thresholds.html b/testing/web-platform/tests/intersection-observer/multiple-thresholds.html
new file mode 100644
index 0000000000..3599e1f722
--- /dev/null
+++ b/testing/web-platform/tests/intersection-observer/multiple-thresholds.html
@@ -0,0 +1,97 @@
+<!DOCTYPE html>
+<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>
+pre, #log {
+  position: absolute;
+  top: 0;
+  left: 200px;
+}
+.spacer {
+  height: calc(100vh + 100px);
+}
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+</style>
+
+<div class="spacer"></div>
+<div id="target"></div>
+<div class="spacer"></div>
+
+<script>
+var vw = document.documentElement.clientWidth;
+var vh = document.documentElement.clientHeight;
+
+var entries = [];
+var target;
+
+runTestCycle(function() {
+  target = document.getElementById("target");
+  var observer = new IntersectionObserver(function(changes) {
+    entries = entries.concat(changes)
+  }, { threshold: [0, 0.25, 0.5, 0.75, 1] });
+  observer.observe(target);
+  entries = entries.concat(observer.takeRecords());
+  assert_equals(entries.length, 0, "No initial notifications.");
+  runTestCycle(step0, "First rAF.");
+}, "Observer with multiple thresholds.");
+
+function step0() {
+  document.scrollingElement.scrollTop = 120;
+  runTestCycle(step1, "document.scrollingElement.scrollTop = 120");
+  checkLastEntry(entries, 0, [8, 108, vh + 108, vh + 208, 0, 0, 0, 0, 0, vw, 0, vh, false]);
+}
+
+function step1() {
+  document.scrollingElement.scrollTop = 160;
+  runTestCycle(step2, "document.scrollingElement.scrollTop = 160");
+  checkLastEntry(entries, 1, [8, 108, vh - 12, vh + 88, 8, 108, vh - 12, vh, 0, vw, 0, vh, true]);
+}
+
+function step2() {
+  document.scrollingElement.scrollTop = 200;
+  runTestCycle(step3, "document.scrollingElement.scrollTop = 200");
+  checkLastEntry(entries, 2, [8, 108, vh - 52, vh + 48, 8, 108, vh - 52, vh, 0, vw, 0, vh, true]);
+}
+
+function step3() {
+  document.scrollingElement.scrollTop = 240;
+  runTestCycle(step4, "document.scrollingElement.scrollTop = 240");
+  checkLastEntry(entries, 3, [8, 108, vh - 92, vh + 8, 8, 108, vh - 92, vh, 0, vw, 0, vh, true]);
+}
+
+function step4() {
+  document.scrollingElement.scrollTop = vh + 140;
+  runTestCycle(step5, "document.scrollingElement.scrollTop = window.innerHeight + 140");
+  checkLastEntry(entries, 4, [8, 108, vh - 132, vh - 32, 8, 108, vh - 132, vh - 32, 0, vw, 0, vh, true]);
+}
+
+function step5() {
+  document.scrollingElement.scrollTop = vh + 160;
+  runTestCycle(step6, "document.scrollingElement.scrollTop = window.innerHeight + 160");
+  checkLastEntry(entries, 5, [8, 108, -32, 68, 8, 108, 0, 68, 0, vw, 0, vh, true]);
+}
+
+function step6() {
+  document.scrollingElement.scrollTop = vh + 200;
+  runTestCycle(step7, "document.scrollingElement.scrollTop = window.innerHeight + 200");
+  checkLastEntry(entries, 6, [8, 108, -52, 48, 8, 108, 0, 48, 0, vw, 0, vh, true]);
+}
+
+function step7() {
+  checkLastEntry(entries, 7, [8, 108, -92, 8, 8, 108, 0, 8, 0, vw, 0, vh, true]);
+  document.scrollingElement.scrollTop = vh + 220;
+  runTestCycle(step8, "document.scrollingElement.scrollTop = window.innerHeight + 220");
+}
+
+function step8() {
+  checkLastEntry(entries, 8, [8, 108, -112, -12, 0, 0, 0, 0, 0, vw, 0, vh, false]);
+  document.scrollingElement.scrollTop = 0;
+}
+</script>