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HTML Guide

Free site validation

Find out what web pages on your sites are affected by HTML issues.

Bad value “X” for attribute “href” on element “link”: Illegal character in path segment: “X” is not allowed.

An illegal character has been found for the “href” attribute on the “link” element.

To fix this issue, find the “link” element in question and make sure that the “href” attribute contains a valid URL without any illegal characters.

Here’s some example HTML code of a link element:

<!DOCTYPE html>
    <title>My Webpage</title>
    <link rel="stylesheet" href="styles/main.css">
    <h1>Welcome to my webpage!</h1>
    <p>Here is some content...</p>

In the above example, the link element has a valid href attribute value of styles/main.css. Make sure that your href attribute values don’t contain any illegal characters.

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Related W3C validator issues