<!DOCTYPE html>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script>
function createRangeWithUnparentedContainerOfSingleElement() {
    const range = document.createRange();
    const container = document.createElement("container");
    const element = document.createElement("element");
    container.appendChild(element);
    range.selectNode(element);
    return range;
}
function nestRangeInOuterContainer(range) {
    range.startContainer.ownerDocument.createElement("outer").appendChild(range.startContainer);
}
function moveNodeToNewlyCreatedDocumentWithAppendChild(node) {
    document.implementation.createDocument(null, null).appendChild(node);
}

//Tests removing only element
test(()=>{
    const range = createRangeWithUnparentedContainerOfSingleElement();
    range.startContainer.removeChild(range.startContainer.firstChild);
    assert_equals(range.endOffset, 0);
}, "Range in document: Removing the only element in the range must collapse the range");


//Tests removing only element after parented container moved to another document
test(()=>{
    const range = createRangeWithUnparentedContainerOfSingleElement();
    nestRangeInOuterContainer(range);
    moveNodeToNewlyCreatedDocumentWithAppendChild(range.startContainer);
    assert_equals(range.endOffset, 0);
}, "Parented range container moved to another document with appendChild: Moving the element to the other document must collapse the range");

//Tests removing only element after parentless container moved oo another document
test(()=>{
    const range = createRangeWithUnparentedContainerOfSingleElement();
    moveNodeToNewlyCreatedDocumentWithAppendChild(range.startContainer);
    range.startContainer.removeChild(range.startContainer.firstChild);
    assert_equals(range.endOffset, 0);
}, "Parentless range container moved to another document with appendChild: Removing the only element in the range must collapse the range");

//Tests removing only element after parentless container of container moved to another document
test(()=>{
    const range = createRangeWithUnparentedContainerOfSingleElement();
    nestRangeInOuterContainer(range);
    moveNodeToNewlyCreatedDocumentWithAppendChild(range.startContainer.parentNode);
    range.startContainer.removeChild(range.startContainer.firstChild);
    assert_equals(range.endOffset, 0);
}, "Range container's parentless container moved to another document with appendChild: Removing the only element in the range must collapse the range");
</script>
