The HTML tag has an attribute or attribute value not allowed

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The HTML tag has an attribute or attribute value not allowed. The problem persists in this code snippet:

<form class="wpcf7-form" action="/wp-admin/post.php?post=4648&amp;
action=edit&amp;message=1#wpcf7-f2766-o1" method="post" novalidate="novalidate">

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You have a "line break" in your url action=""!

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See what it says on the validator W3C

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If you fix this url you will see that there will be no error in the validation, at least in the validator W3C not of error! https://validator.w3.org/nu/#textarea

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Be careful to put everything concatenated, without letting break the line

<form class="wpcf7-form" action="/wp-admin/post.php?post=4648&amp;action=edit&amp;message=1#wpcf7-f2766-o1" method="post" novalidate="novalidate">
</form>

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