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<!DOCTYPE HTML>
<meta charset="utf-8" />
<title>HTML partial updates - streamHTMLUnsafe</title>
<link rel=help href="https://github.com/WICG/declarative-partial-updates">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id="style"></style>
<p id="target"></p>
<script>
promise_test(async t => {
const placeholder = document.createElement("div");
placeholder.innerHTML = "A";
const writable = placeholder.streamHTMLUnsafe();
assert_true(writable instanceof WritableStream, "node.streamHTMLUnsafe() returns a writable stream");
const response = new Response("<span>B</span>", {headers: {"Content-Type": "text/html"}});
await response.body.pipeThrough(new TextDecoderStream()).pipeTo(writable);
assert_equals(placeholder.textContent, "B");
assert_true(response.bodyUsed);
}, "piping a response into streamHTMLUnsafe()");
promise_test(async t => {
const placeholder = document.createElement("div");
placeholder.innerHTML = "<span>A</span>";
const writable = placeholder.streamHTMLUnsafe();
assert_true(writable instanceof WritableStream, "node.streamHTMLUnsafe() returns a writable stream");
const writer = writable.getWriter();
await writer.write("B");
await writer.close();
assert_equals(placeholder.textContent, "B");
}, "writing a string to streamHTMLUnsafe()");
promise_test(async t => {
const placeholder = document.createElement("div");
placeholder.innerHTML = "<span>A</span>";
const writable = placeholder.streamHTMLUnsafe();
assert_true(writable instanceof WritableStream, "node.streamHTMLUnsafe() returns a writable stream");
assert_equals(placeholder.textContent, "");
const writer = writable.getWriter();
await writer.write("B");
await writer.close();
assert_equals(placeholder.textContent, "B");
}, "streamHTMLUnsafe() should remove existing content immediately");
promise_test(async t => {
const placeholder = document.createElement("div");
placeholder.innerHTML = "<span>A</span>";
const writable = placeholder.streamHTMLUnsafe();
assert_true(writable instanceof WritableStream, "node.streamHTMLUnsafe() returns a writable stream");
const writer = writable.getWriter();
await writer.write("<span>B</span>");
assert_equals(placeholder.textContent, "B");
await writer.close();
}, "streamHTMLUnsafe() does not buffer until close()");
promise_test(async t => {
const placeholder = document.createElement("div");
placeholder.innerHTML = "Before";
const writable = placeholder.streamHTMLUnsafe();
assert_true(writable instanceof WritableStream, "streamHTMLUnsafe() returns a writable stream");
const writer = writable.getWriter();
await promise_rejects_js(t, TypeError, writer.write(Symbol("sym")));
assert_equals(placeholder.textContent, "");
}, "writing a Symbol to streamHTMLUnsafe()");
promise_test(async t => {
const placeholder = document.createElement("div");
placeholder.innerHTML = "12";
const writable = placeholder.streamHTMLUnsafe();
assert_true(writable instanceof WritableStream, "node.streamHTMLUnsafe() returns a writable stream");
const writer = writable.getWriter();
await writer.write(345);
await writer.close();
assert_equals(placeholder.textContent, "345");
assert_equals(placeholder.childNodes.length, 1);
assert_equals(placeholder.firstChild.nodeType, Node.TEXT_NODE);
assert_equals(placeholder.firstChild.textContent, "345");
}, "writing numbers to streamHTMLUnsafe()");
promise_test(async t => {
const placeholder = document.createElement("div");
placeholder.innerHTML = "start ";
const writable = placeholder.streamHTMLUnsafe();
assert_true(writable instanceof WritableStream, "node.streamHTMLUnsafe() returns a writable stream");
const writer = writable.getWriter();
await writer.write(null);
await writer.write(" ");
await writer.write(undefined);
await writer.close();
assert_equals(placeholder.textContent, "null undefined");
}, "writing null or undefined to streamHTMLUnsafe()");
promise_test(async t => {
const style = document.querySelector("#style");
const writable = style.streamHTMLUnsafe();
assert_true(writable instanceof WritableStream, "node.streamHTMLUnsafe() returns a writable stream");
const writer = await writable.getWriter();
await writer.write("#target { color: rgba(100, 0, 100); }");
await writer.close();
assert_equals(getComputedStyle(document.querySelector("#target")).color, "rgb(100, 0, 100)");
}, "streamHTMLUnsafe() can stream into <style>");
promise_test(async t => {
const placeholder = document.createElement("div");
placeholder.innerHTML = "start ";
const writable = placeholder.streamHTMLUnsafe();
const writer = writable.getWriter();
await writer.write("ABC");
await writer.abort("abort-reason");
await writer.write("DEF").catch(() => {});
assert_equals(placeholder.textContent, "ABC");
}, "Aborting streamHTMLUnsafe()");
promise_test(async t => {
const placeholder = document.createElement("div");
placeholder.innerHTML = "before";
const writer1 = placeholder.streamHTMLUnsafe().getWriter();
const writer2 = placeholder.streamHTMLUnsafe().getWriter();
await writer1.write("<span>A</span>");
await writer2.write("<span>B</span>");
await new Promise(resolve => requestAnimationFrame(resolve));
await writer1.write("C");
await writer1.close();
await writer2.close();
assert_equals(placeholder.textContent, "ABC");
}, "Interleaved streamHTMLUnsafe() writes");
promise_test(async t => {
const element = document.createElement("div");
const shadowRoot = element.attachShadow({mode: "open"});
shadowRoot.innerHTML = "before";
const writer = shadowRoot.streamHTMLUnsafe().getWriter();
await writer.write("<div id=added>A</div>");
assert_equals(shadowRoot.getElementById("added").textContent, "A");
}, "streamHTMLUnsafe into a ShadowRoot");
promise_test(async t => {
const element = document.createElement("template");
element.innerHTML = "before";
const writer = element.streamHTMLUnsafe().getWriter();
await writer.write("<div id=added>A</div>");
assert_equals(element.content.getElementById("added").textContent, "A");
}, "streamHTMLUnsafe into a template");
promise_test(async t => {
const element = document.createElement("div");
document.body.append(element);
window.did_eval_script = false;
const writer = element.streamHTMLUnsafe({runScripts: true}).getWriter();
assert_false(window.did_eval_script);
await writer.write("<script>window.did_eval_script = true;");
assert_false(window.did_eval_script);
await writer.write("<");
assert_false(window.did_eval_script);
await writer.write("/script>");
assert_true(window.did_eval_script);
}, "streamHTMLUnsafe should execute scripts when connected");
promise_test(async t => {
const element = document.createElement("div");
window.did_eval_script = false;
const writer = element.streamHTMLUnsafe({runScripts: true}).getWriter();
assert_false(window.did_eval_script);
await writer.write("<script>window.did_eval_script = true;");
assert_false(window.did_eval_script);
await writer.write("<");
assert_false(window.did_eval_script);
await writer.write("/script>");
assert_false(window.did_eval_script);
}, "streamHTMLUnsafe should not execute scripts when disconnected");
</script>
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