HTML Checking for Large Sites
Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as backslash.
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="https://example.com/img/small/photo.png" alt="example image">
Also, make sure that the URL is correct and that the image file actually exists in the specified location.
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