Bug 1510489 [wpt PR 14266] - WebKit export of https://bugs.webkit.org/show_bug.cgi?id=191975, a=testonly

Automatic update from web-platform-tests WebKit export of https://bugs.webkit.org/show_bug.cgi?id=191975 (#14266) * WebKit export of https://bugs.webkit.org/show_bug.cgi?id=191975 * Intersection Observer: rootMargin: '' gives weird results -- wpt-commits: 3be4e5e87f7272be103f897f32448d2e42c21b01 wpt-pr: 14266
2018-11-30 18:05:23 +00:00 · 2018-11-30 18:05:23 +00:00 · 5aec04b6a0
--- a/testing/web-platform/tests/intersection-observer/empty-root-margin.html
+++ b/testing/web-platform/tests/intersection-observer/empty-root-margin.html
@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+#target {
+  width: 100px;
+  height: 100px;
+  background-color: green;
+}
+</style>
+
+<div id="target"></div>
+
+<script>
+var target = document.getElementById("target");
+async_test((t) => {
+    var observer = new IntersectionObserver(t.step_func_done((entries) => {
+        var rootBounds = entries[0].rootBounds;
+        assert_equals(rootBounds.left, 0);
+        assert_equals(rootBounds.right, document.documentElement.clientWidth);
+        assert_equals(rootBounds.top, 0);
+        assert_equals(rootBounds.bottom, document.documentElement.clientHeight);
+        observer.disconnect();
+    }), { rootMargin: "" });
+    observer.observe(document.getElementById("target"));
+}, "An empty rootMargin string is interpreted as a margin of size zero");
+</script>