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function prepare_html_partial_update(target_type, ref_type, pos, t) {
const div = document.createElement("div");
document.body.append(div);
t.add_cleanup(() => div.remove());
let target = div;
if (target_type === "ShadowRoot") {
const shadow_root = div.attachShadow({ mode: "open" });
target = shadow_root;
}
let ref = document.createElement("span");
switch (ref_type) {
case "Element":
ref.textContent = "ref;";
break;
case "Comment":
ref = document.createComment("ref;");
break;
case "Text":
ref = document.createTextNode("ref;");
break;
case "ProcessingInstruction":
ref = document.createProcessingInstruction("ref", "");
break;
default:
throw new Error("Invalid ref_type");
}
target.append(ref);
const object = ["append", "prepend"].includes(pos) ? target : ref;
return { target, ref, object };
}
function check_position(target, pos, ref) {
switch (pos) {
case "before":
assert_equals(target.firstChild.textContent, "html;");
assert_equals(target.firstChild.nextSibling, ref);
break;
case "prepend":
assert_equals(target.textContent, "html;ref;");
break;
case "after":
assert_equals(target.lastChild.textContent, "html;");
assert_equals(target.firstChild, ref);
break;
case "append":
assert_equals(target.textContent, "ref;html;");
break;
case "replaceWith":
assert_equals(target.textContent, "html;");
assert_equals(target.firstChild, target.lastChild);
break;
}
}