<!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>