<!
DOCTYPE html>
<
title>The getRangeAt method</
title>
<
script src=/resources/testharness.js></
script>
<
script src=/resources/testharnessreport.js></
script>
<
link rel=
"help" href=
"https://w3c.github.io/selection-api/#dom-selection-getrangeat">
<
body>
<
script>
const sel = getSelection();
test(function() {
var range = document.createRange();
sel.addRange(range);
assert_throws_dom(
"INDEX_SIZE_ERR", function() { sel.getRangeAt(-1); })
assert_throws_dom(
"INDEX_SIZE_ERR", function() { sel.getRangeAt(1); })
},
"Only supports index 0");
test(() => {
sel.removeAllRanges();
assert_throws_dom(
"INDEX_SIZE_ERR", () => sel.getRangeAt(0))
},
"Throws when with no range");
test(() => {
sel.addRange(document.createRange());
assert_equals(sel.getRangeAt(0), sel.getRangeAt(0));
},
"Returns the same range object when with no selection change");
test(() => {
const range = sel.getRangeAt(0);
sel.collapse(document.
body);
assert_not_equals(range, sel.getRangeAt(0));
},
"Returns a different range object when with selection change");
</
script>
