Wordpress Generating Invalid Markup, How To Remove It?

Hi I am trying to get the categories associated with a post in it's meta section by using the following code:

FILED AS:

Solution 1:

These two rel values are not invalid. The validator is not up to date.

• tag is defined in the HTML5 spec.
• category is registered officially.

So it's no problem to use these values. The validator will probably catch up in the future.

Solution 2:

Just paste the following code in your functions.php file inside your theme folder

functionremove_category_rel($output)
{
    $output = str_replace(' rel="category tag"', '', $output);
    return$output;
}
add_filter('the_category', 'remove_category_rel');

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