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HTML Checking for Large Sites

Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.

This error message indicates that there is a backslash (\) used in a URL, which is not a valid character for URL paths.

You’ll need to replace the backslashes with forward slashes (/) in the URL path segments.

Here’s an example of a correct img tag using a valid URL path:

<img src="" alt="example image">

Also, make sure that the URL is correct and that the image file actually exists in the specified location.

Related W3C validator issues