HTML Checking for Large Sites

Rocket Validator automatically checks your pages on the W3C Validator.

Attribute “xmlns:og” not allowed here.

The old way for using Open Graph Protocol tags in web pages is not valid HTML5, you should use the updated markup as specified in https://ogp.me

As an example, the following is the Open Graph protocol markup for The Rock on IMDB:

<!DOCTYPE html>
<html lang="en" prefix="og: https://ogp.me/ns#">
<head>
<title>The Rock (1996)</title>
<meta property="og:title" content="The Rock" />
<meta property="og:type" content="video.movie" />
<meta property="og:url" content="https://www.imdb.com/title/tt0117500/" />
<meta property="og:image" content="https://ia.media-imdb.com/images/rock.jpg" />
</head>
</html>

Learn more:

* W3C: @xmlns deprecation

* Open Graph Protocol

Related W3C validator issues

25,000 HTML checks per month. Is that enough for your site?

Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.