Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
Attributes in HTML elements need to be separated by space, in this example the first line is invalid and the second one is valid:
<a href="page.php"class="big">link</a> <a href="page.php" class="big">link</a>
Related W3C validator issues
<a> tags can be used to link to an email address using the mailto protocol in the href attribute. Ensure that there is no space in the email address.
<a href="mailto: email@example.com">This is wrong as it contains an space</a> <a href="mailto:firstname.lastname@example.org">This is OK</a>
The href attribute on an <a> link contains a space character, which is not allowed. If you’re trying to link to a phone URL, review the href attribute to remove unallowed characters, as in this example:
<!-- Invalid as it contains a space character --> <a href="tel: +123456789">call me</a> <!-- Valid --> <a href="tel:+123456789">call me</a>
A < character has been found when an attribute was expected instead. Check the syntax of the affected tag, it’s probably malformed and a < character inside has been interpreted as an attribute.
For example, this code might cause this issue:
<!-- Malformed img tag --> <img src="photo.jpg" alt="smiling cat" < /> <!-- Fixed img tag --> <img src="photo.jpg" alt="smiling cat" />
Attributes for HTML elements must be defined like name="value". A common issue is missing the =, or repeating the " like in these examples:
<!-- Missing equal sign --> <p name "value"></p> <!-- Repeated quotes --> <p name="value""></p>
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