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diff --git a/packages/integrations/markdoc/test/render-html.test.js b/packages/integrations/markdoc/test/render-html.test.js
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+import assert from 'node:assert/strict';
+import { after, before, describe, it } from 'node:test';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+async function getFixture(name) {
+	return await loadFixture({
+		root: new URL(`./fixtures/${name}/`, import.meta.url),
+	});
+}
+
+describe('Markdoc - render html', () => {
+	let fixture;
+
+	before(async () => {
+		fixture = await getFixture('render-html');
+	});
+
+	describe('dev', () => {
+		let devServer;
+
+		before(async () => {
+			devServer = await fixture.startDevServer();
+		});
+
+		after(async () => {
+			await devServer.stop();
+		});
+
+		it('renders content - simple', async () => {
+			const res = await fixture.fetch('/simple');
+			const html = await res.text();
+
+			renderSimpleChecks(html);
+		});
+
+		it('renders content - nested-html', async () => {
+			const res = await fixture.fetch('/nested-html');
+			const html = await res.text();
+
+			renderNestedHTMLChecks(html);
+		});
+
+		it('renders content - components interleaved with html', async () => {
+			const res = await fixture.fetch('/components');
+			const html = await res.text();
+
+			renderComponentsHTMLChecks(html);
+		});
+
+		it('renders content - randomly cased html attributes', async () => {
+			const res = await fixture.fetch('/randomly-cased-html-attributes');
+			const html = await res.text();
+
+			renderRandomlyCasedHTMLAttributesChecks(html);
+		});
+
+		it('renders content - html within partials', async () => {
+			const res = await fixture.fetch('/with-partial');
+			const html = await res.text();
+
+			renderHTMLWithinPartialChecks(html);
+		});
+	});
+
+	describe('build', () => {
+		before(async () => {
+			await fixture.build();
+		});
+
+		it('renders content - simple', async () => {
+			const html = await fixture.readFile('/simple/index.html');
+
+			renderSimpleChecks(html);
+		});
+
+		it('renders content - nested-html', async () => {
+			const html = await fixture.readFile('/nested-html/index.html');
+
+			renderNestedHTMLChecks(html);
+		});
+
+		it('renders content - components interleaved with html', async () => {
+			const html = await fixture.readFile('/components/index.html');
+
+			renderComponentsHTMLChecks(html);
+		});
+
+		it('renders content - randomly cased html attributes', async () => {
+			const html = await fixture.readFile('/randomly-cased-html-attributes/index.html');
+
+			renderRandomlyCasedHTMLAttributesChecks(html);
+		});
+
+		it('renders content - html within partials', async () => {
+			const html = await fixture.readFile('/with-partial/index.html');
+
+			renderHTMLWithinPartialChecks(html);
+		});
+	});
+});
+
+/** @param {string} html */
+function renderSimpleChecks(html) {
+	const { document } = parseHTML(html);
+
+	const h2 = document.querySelector('h2');
+	assert.equal(h2.textContent, 'Simple post header');
+
+	const spanInsideH2 = document.querySelector('h2 > span');
+	assert.equal(spanInsideH2.textContent, 'post');
+	assert.equal(spanInsideH2.className, 'inside-h2');
+	assert.equal(spanInsideH2.style.color, 'fuscia');
+
+	const p1 = document.querySelector('article > p:nth-of-type(1)');
+	assert.equal(p1.children.length, 1);
+	assert.equal(p1.textContent, 'This is a simple Markdoc post.');
+
+	const p2 = document.querySelector('article > p:nth-of-type(2)');
+	assert.equal(p2.children.length, 0);
+	assert.equal(p2.textContent, 'This is a paragraph!');
+
+	const p3 = document.querySelector('article > p:nth-of-type(3)');
+	assert.equal(p3.children.length, 1);
+	assert.equal(p3.textContent, 'This is a span inside a paragraph!');
+
+	const video = document.querySelector('video');
+	assert.ok(video, 'A video element should exist');
+	assert.ok(video.hasAttribute('autoplay'), 'The video element should have the autoplay attribute');
+	assert.ok(video.hasAttribute('muted'), 'The video element should have the muted attribute');
+}
+
+/** @param {string} html */
+function renderNestedHTMLChecks(html) {
+	const { document } = parseHTML(html);
+
+	const p1 = document.querySelector('p:nth-of-type(1)');
+	assert.equal(p1.id, 'p1');
+	assert.equal(p1.textContent, 'before inner after');
+	assert.equal(p1.children.length, 1);
+
+	const p1Span1 = p1.querySelector('span');
+	assert.equal(p1Span1.textContent, 'inner');
+	assert.equal(p1Span1.id, 'inner1');
+	assert.equal(p1Span1.className, 'inner-class');
+	assert.equal(p1Span1.style.color, 'hotpink');
+
+	const p2 = document.querySelector('p:nth-of-type(2)');
+	assert.equal(p2.id, 'p2');
+	assert.equal(p2.textContent, '\n  before\n  inner\n  after\n');
+	assert.equal(p2.children.length, 1);
+
+	const divL1 = document.querySelector('div:nth-of-type(1)');
+	assert.equal(divL1.id, 'div-l1');
+	assert.equal(divL1.children.length, 2);
+
+	const divL2_1 = divL1.querySelector('div:nth-of-type(1)');
+	assert.equal(divL2_1.id, 'div-l2-1');
+	assert.equal(divL2_1.children.length, 1);
+
+	const p3 = divL2_1.querySelector('p:nth-of-type(1)');
+	assert.equal(p3.id, 'p3');
+	assert.equal(p3.textContent, 'before inner after');
+	assert.equal(p3.children.length, 1);
+
+	const divL2_2 = divL1.querySelector('div:nth-of-type(2)');
+	assert.equal(divL2_2.id, 'div-l2-2');
+	assert.equal(divL2_2.children.length, 2);
+
+	const p4 = divL2_2.querySelector('p:nth-of-type(1)');
+	assert.equal(p4.id, 'p4');
+	assert.equal(p4.textContent, 'before inner after');
+	assert.equal(p4.children.length, 1);
+
+	const p5 = divL2_2.querySelector('p:nth-of-type(2)');
+	assert.equal(p5.id, 'p5');
+	assert.equal(p5.textContent, 'before inner after');
+	assert.equal(p5.children.length, 1);
+}
+
+/**
+ *
+ * @param {string} html */
+function renderRandomlyCasedHTMLAttributesChecks(html) {
+	const { document } = parseHTML(html);
+
+	const td1 = document.querySelector('#td1');
+	const td2 = document.querySelector('#td1');
+	const td3 = document.querySelector('#td1');
+	const td4 = document.querySelector('#td1');
+
+	// all four <td>'s which had randomly cased variants of colspan/rowspan should all be rendered lowercased at this point
+
+	assert.equal(td1.getAttribute('colspan'), '3');
+	assert.equal(td1.getAttribute('rowspan'), '2');
+
+	assert.equal(td2.getAttribute('colspan'), '3');
+	assert.equal(td2.getAttribute('rowspan'), '2');
+
+	assert.equal(td3.getAttribute('colspan'), '3');
+	assert.equal(td3.getAttribute('rowspan'), '2');
+
+	assert.equal(td4.getAttribute('colspan'), '3');
+	assert.equal(td4.getAttribute('rowspan'), '2');
+}
+
+/**
+ * @param {string} html
+ */
+function renderHTMLWithinPartialChecks(html) {
+	const { document } = parseHTML(html);
+
+	const li = document.querySelector('ul > li#partial');
+	assert.equal(li.textContent, 'List item');
+}
+
+/**
+ * Asserts that the rendered HTML tags with interleaved Markdoc tags (both block and inline) rendered in the expected nested graph of elements
+ *
+ * @param {string} html */
+function renderComponentsHTMLChecks(html) {
+	const { document } = parseHTML(html);
+
+	const naturalP1 = document.querySelector('article > p:nth-of-type(1)');
+	assert.equal(naturalP1.textContent, 'This is a inline mark in regular Markdown markup.');
+	assert.equal(naturalP1.children.length, 1);
+
+	const p1 = document.querySelector('article > p:nth-of-type(2)');
+	assert.equal(p1.id, 'p1');
+	assert.equal(p1.textContent, 'This is a inline mark under some HTML');
+	assert.equal(p1.children.length, 1);
+	assertInlineMark(p1.children[0]);
+
+	const div1p1 = document.querySelector('article > #div1 > p:nth-of-type(1)');
+	assert.equal(div1p1.id, 'div1-p1');
+	assert.equal(div1p1.textContent, 'This is a inline mark under some HTML');
+	assert.equal(div1p1.children.length, 1);
+	assertInlineMark(div1p1.children[0]);
+
+	const div1p2 = document.querySelector('article > #div1 > p:nth-of-type(2)');
+	assert.equal(div1p2.id, 'div1-p2');
+	assert.equal(div1p2.textContent, 'This is a inline mark under some HTML');
+	assert.equal(div1p2.children.length, 1);
+
+	const div1p2span1 = div1p2.querySelector('span');
+	assert.equal(div1p2span1.id, 'div1-p2-span1');
+	assert.equal(div1p2span1.textContent, 'inline mark');
+	assert.equal(div1p2span1.children.length, 1);
+	assertInlineMark(div1p2span1.children[0]);
+
+	const aside1 = document.querySelector('article > aside:nth-of-type(1)');
+	const aside1Title = aside1.querySelector('p.title');
+	assert.equal(aside1Title.textContent.trim(), 'Aside One');
+	const aside1Section = aside1.querySelector('section');
+	const aside1SectionP1 = aside1Section.querySelector('p:nth-of-type(1)');
+	assert.equal(
+		aside1SectionP1.textContent,
+		"I'm a Markdown paragraph inside an top-level aside tag",
+	);
+	const aside1H2_1 = aside1Section.querySelector('h2:nth-of-type(1)');
+	assert.equal(aside1H2_1.id, 'im-an-h2-via-markdown-markup'); // automatic slug
+	assert.equal(aside1H2_1.textContent, "I'm an H2 via Markdown markup");
+	const aside1H2_2 = aside1Section.querySelector('h2:nth-of-type(2)');
+	assert.equal(aside1H2_2.id, 'h-two');
+	assert.equal(aside1H2_2.textContent, "I'm an H2 via HTML markup");
+	const aside1SectionP2 = aside1Section.querySelector('p:nth-of-type(2)');
+	assert.equal(aside1SectionP2.textContent, 'Markdown bold vs HTML bold');
+	assert.equal(aside1SectionP2.children.length, 2);
+	const aside1SectionP2Strong1 = aside1SectionP2.querySelector('strong:nth-of-type(1)');
+	assert.equal(aside1SectionP2Strong1.textContent, 'Markdown bold');
+	const aside1SectionP2Strong2 = aside1SectionP2.querySelector('strong:nth-of-type(2)');
+	assert.equal(aside1SectionP2Strong2.textContent, 'HTML bold');
+
+	const article = document.querySelector('article');
+	assert.equal(article.textContent.includes('RENDERED'), true);
+	assert.notEqual(article.textContent.includes('NOT RENDERED'), true);
+
+	const section1 = document.querySelector('article > #section1');
+	const section1div1 = section1.querySelector('#div1');
+	const section1Aside1 = section1div1.querySelector('aside:nth-of-type(1)');
+	const section1Aside1Title = section1Aside1.querySelector('p.title');
+	assert.equal(section1Aside1Title.textContent.trim(), 'Nested un-indented Aside');
+	const section1Aside1Section = section1Aside1.querySelector('section');
+	const section1Aside1SectionP1 = section1Aside1Section.querySelector('p:nth-of-type(1)');
+	assert.equal(section1Aside1SectionP1.textContent, 'regular Markdown markup');
+	const section1Aside1SectionP4 = section1Aside1Section.querySelector('p:nth-of-type(2)');
+	assert.equal(section1Aside1SectionP4.textContent, 'nested inline mark content');
+	assert.equal(section1Aside1SectionP4.children.length, 1);
+	assertInlineMark(section1Aside1SectionP4.children[0]);
+
+	const section1div2 = section1.querySelector('#div2');
+	const section1Aside2 = section1div2.querySelector('aside:nth-of-type(1)');
+	const section1Aside2Title = section1Aside2.querySelector('p.title');
+	assert.equal(section1Aside2Title.textContent.trim(), 'Nested indented Aside 💀');
+	const section1Aside2Section = section1Aside2.querySelector('section');
+	const section1Aside2SectionP1 = section1Aside2Section.querySelector('p:nth-of-type(1)');
+	assert.equal(section1Aside2SectionP1.textContent, 'regular Markdown markup');
+	const section1Aside1SectionP5 = section1Aside2Section.querySelector('p:nth-of-type(2)');
+	assert.equal(section1Aside1SectionP5.id, 'p5');
+	assert.equal(section1Aside1SectionP5.children.length, 1);
+	const section1Aside1SectionP5Span1 = section1Aside1SectionP5.children[0];
+	assert.equal(section1Aside1SectionP5Span1.textContent, 'inline mark');
+	assert.equal(section1Aside1SectionP5Span1.children.length, 1);
+	const section1Aside1SectionP5Span1Span1 = section1Aside1SectionP5Span1.children[0];
+	assert.equal(section1Aside1SectionP5Span1Span1.textContent, ' mark');
+}
+
+/** @param {HTMLElement | null | undefined} el */
+
+function assertInlineMark(el) {
+	assert.ok(el);
+	assert.equal(el.children.length, 0);
+	assert.equal(el.textContent, 'inline mark');
+	assert.equal(el.className, 'mark');
+	assert.equal(el.style.color, 'hotpink');
+}