<!DOCTYPE html>
<html>
<body>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
<meta name="assert" content="Selection's direction should return none, forwad, or backward">
<link rel="help" href="https://w3c.github.io/selection-api/#dom-selection-getcomposedrange">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="container"></div>
<script>

test(() => {
    getSelection().removeAllRanges();
    assert_equals(getSelection().direction, 'none');
}, 'direction returns "none" when there is no selection');

test(() => {
    container.innerHTML = 'hello, world';
    getSelection().setBaseAndExtent(container.firstChild, 0, container.firstChild, 5);
    assert_equals(getSelection().direction, 'forward');
}, 'direction returns "forward" when there is a forward-direction selection in the document tree');

test(() => {
    container.innerHTML = 'hello, world';
    getSelection().setBaseAndExtent(container.firstChild, 4, container.firstChild, 3);
    assert_equals(getSelection().direction, 'backward');
}, 'direction returns "backward" when there is a backward-direction selection in the document tree');

test(() => {
    container.innerHTML = 'a<div id="host"></div>b';
    const shadowRoot = host.attachShadow({mode: 'closed'});
    shadowRoot.innerHTML = 'hello, world';
    getSelection().setBaseAndExtent(shadowRoot.firstChild, 0, shadowRoot.firstChild, 5);
    assert_equals(getSelection().direction, 'forward');
}, 'direction returns "forward" when there is a forward selection in the shadow tree');

test(() => {
    container.innerHTML = 'a<div id="host"></div>b';
    const shadowRoot = host.attachShadow({mode: 'closed'});
    shadowRoot.innerHTML = 'hello, world';
    getSelection().setBaseAndExtent(shadowRoot.firstChild, 5, shadowRoot.firstChild, 3);
    assert_equals(getSelection().direction, 'backward');
}, 'direction returns "backward" when there is a backward selection in the shadow tree');

test(() => {
    container.innerHTML = 'a<div id="host"></div>b';
    const shadowRoot = host.attachShadow({mode: 'closed'});
    shadowRoot.innerHTML = 'hello, world';
    getSelection().setBaseAndExtent(shadowRoot.firstChild, 7, container, 2);
    assert_equals(getSelection().direction, 'forward');
}, 'direction returns "forward" when there is a forward selection that crosses shadow boundaries');

test(() => {
    container.innerHTML = 'a<div id="host"></div>b';
    const shadowRoot = host.attachShadow({mode: 'closed'});
    shadowRoot.innerHTML = 'hello, world';
    getSelection().setBaseAndExtent(shadowRoot.firstChild, 7, container, 1);
    assert_equals(getSelection().direction, 'backward');
}, 'direction returns "backward" when there is a forward selection that crosses shadow boundaries');

</script>
</body>
</html>
