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<!doctype html>
<title>Selection Document.open() tests</title>
<div id=log></div>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
"use strict";
const iframe = document.createElement("iframe");
async_test(t => {
iframe.onload = t.step_func_done(() => {
const originalSelection = iframe.contentWindow.getSelection();
assert_equals(originalSelection.rangeCount, 0, "rangeCount must initially be 0");
iframe.contentDocument.body.appendChild(iframe.contentDocument.createTextNode("foo"));
const range = iframe.contentDocument.createRange();
range.selectNodeContents(iframe.contentDocument.body);
iframe.contentWindow.getSelection().addRange(range);
assert_equals(originalSelection.rangeCount, 1, "rangeCount must be 1 after adding a range");
iframe.contentDocument.open();
assert_equals(iframe.contentWindow.getSelection(), originalSelection, "After document.open(), the Selection object must be the same");
assert_equals(iframe.contentWindow.getSelection().rangeCount, 1, "After document.open(), rangeCount must still be 1");
document.body.removeChild(iframe);
});
document.body.appendChild(iframe);
}, "Selection must not be replaced with a new object after document.open()");
</script>
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