empty-root-margin.html

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This WPT test may be referenced by the following Test IDs:
- /intersection-observer/empty-root-margin.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta name="viewport" content="width=device-width,initial-scale=1">

<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>