| CARVIEW |
Select Language
HTTP/2 200
content-type: text/html
x-guploader-uploadid: AAwnv3JX2I2VNDczWktKbKD3NwaagVTHfLzYz85mICDCK9CespoboO9kD45fPCjLaXTfh2yr
cache-control: public, max-age=3600
expires: Sat, 11 Oct 2025 03:38:00 GMT
last-modified: Fri, 10 Oct 2025 01:04:21 GMT
etag: W/"c9833fafb7484fbfb368aea799ded6ec"
x-goog-generation: 1760058261355293
x-goog-metageneration: 1
x-goog-stored-content-encoding: identity
x-goog-stored-content-length: 171578
x-goog-meta-goog-reserved-file-mtime: 1760056608
x-goog-hash: crc32c=6BieoQ==, md5=yYM/r7dIT7+zaK6nmd7W7A==
x-goog-storage-class: STANDARD
accept-ranges: none
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
alt-svc: clear
referrer-policy: strict-origin-when-cross-origin
x-content-type-options: nosniff
strict-transport-security: max-age=63072000
content-security-policy: default-src 'self'; script-src 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M=' 'sha256-YCNoU9DNiinACbd8n6UPyB/8vj0kXvhkOni9/06SuYw=' 'sha256-PZjP7OR6mBEtnvXIZfCZ5PuOlxoDF1LDZL8aj8c42rw='; script-src-elem 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M=' 'sha256-YCNoU9DNiinACbd8n6UPyB/8vj0kXvhkOni9/06SuYw=' 'sha256-PZjP7OR6mBEtnvXIZfCZ5PuOlxoDF1LDZL8aj8c42rw='; style-src 'report-sample' 'self' 'unsafe-inline'; object-src 'none'; base-uri 'self'; connect-src 'self' developer.allizom.org bcd.developer.allizom.org bcd.developer.mozilla.org updates.developer.allizom.org updates.developer.mozilla.org https://*.google-analytics.com https://*.analytics.google.com https://*.googletagmanager.com https://incoming.telemetry.mozilla.org https://observatory-api.mdn.allizom.net https://observatory-api.mdn.mozilla.net https://api.github.com/search/issues stats.g.doubleclick.net https://api.stripe.com; font-src 'self'; frame-src 'self' interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net mdn.github.io live-samples.mdn.mozilla.net live-samples.mdn.allizom.net *.mdnplay.dev *.mdnyalp.dev *.play.test.mdn.allizom.net https://v2.scrimba.com https://scrimba.com jsfiddle.net www.youtube-nocookie.com codepen.io survey.alchemer.com https://js.stripe.com; img-src 'self' data: *.githubusercontent.com *.googleusercontent.com *.gravatar.com mozillausercontent.com firefoxusercontent.com profile.stage.mozaws.net profile.accounts.firefox.com developer.mozilla.org mdn.dev interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net wikipedia.org upload.wikimedia.org https://mdn.github.io/shared-assets/ https://mdn.dev/ https://*.google-analytics.com https://*.googletagmanager.com www.gstatic.com; manifest-src 'self'; media-src 'self' archive.org videos.cdn.mozilla.net https://mdn.github.io/shared-assets/; child-src 'self'; worker-src 'self';
x-frame-options: DENY
origin-trial: AxVILwizhbMjxFeHOn1P3R8niO1RJY/smaK4B4d1rLzc1gTaxtXMSaTi+FoigYgCw40uFRDwFcEAeqDR+vVLOW4AAABfeyJvcmlnaW4iOiJodHRwczovL2RldmVsb3Blci5tb3ppbGxhLm9yZyIsImZlYXR1cmUiOiJQcml2YXRlQXR0cmlidXRpb25WMiIsImV4cGlyeSI6MTc0MjA3OTYwMH0=
x-cloud-trace-context: 6424ac7ccce24ca41a4e5e4fb6c39a9a
date: Sat, 11 Oct 2025 02:38:00 GMT
server: Google Frontend
via: 1.1 google
vary: Accept-Encoding
content-encoding: gzip
x-cache: miss
XHTML - Glossary | MDN
XHTML
XHTML is a term that was historically used to describe HTML documents written to conform with XML syntax rules.
The following example shows an HTML document and corresponding "XHTML" document, and the accompanying HTTP Content-Type headers they should be served with.
HTML document
html
<!-- Content-Type: text/html -->
<!doctype html>
<html lang="en-US">
<head>
<meta charset="utf-8" />
<title>HTML</title>
</head>
<body>
<p>I am a HTML document</p>
</body>
</html>
XHTML document
xml
<!-- Content-Type: application/xhtml+xml -->
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="https://www.w3.org/1999/xhtml" xml:lang="en-US">
<head>
<title>XHTML</title>
</head>
<body>
<p>I am a XHTML document</p>
</body>
</html>
In practice, very few "XHTML" documents are served over the web with a Content-Type: application/xhtml+xml header. Instead, even though the documents are written to conform to XML syntax rules, they are served with a Content-Type: text/html header — so browsers parse those documents using HTML parsers rather than XML parsers.