mcseller on "[Plugin: Contact Form 7] W3C XHTML 1.0 Transitional Validation Errors"

Please try to explain why the first line of code fails validation with there is no attribute "aria required" error, the next two lines are ok and the last line of code fails validation with there is no attribute "aria required" error and there is no attribute "maxlength" error

<li><p>Il tuo nome (richiesto<a href="#richiesto"><sup><strong>1</strong></sup></a>)<br/><span class="wpcf7-form-control-wrap your-name"><input type="text" name="your-name" value="" size="30" maxlength="50" class="wpcf7-form-control wpcf7-text wpcf7-validates-as-required" aria-required="true" /></span></p>
1. <p>La tua email (richiesto<a href="#richiesto"><sup><strong>1</strong></sup></a>)<br/><span class="wpcf7-form-control-wrap your-email"><input type="text" name="your-email" value="" size="30" maxlength="50" class="wpcf7-form-control wpcf7-text wpcf7-email wpcf7-validates-as-required wpcf7-validates-as-email" aria-required="true" /></span></p>
2. <p>Oggetto (richiesto<a href="#richiesto"><sup><strong>1</strong></sup></a>)<br/><span class="wpcf7-form-control-wrap your-subject"><input type="text" name="your-subject" value="" size="30" maxlength="50" class="wpcf7-form-control wpcf7-text wpcf7-validates-as-required" aria-required="true" /></span></p>
3. <p>Il tuo messaggio (richiesto<a href="#richiesto"><sup><strong>1</strong></sup></a>)<br/><span class="wpcf7-form-control-wrap your-message"><textarea name="your-message" cols="43" rows="10" maxlength="512" class="wpcf7-form-control wpcf7-textarea wpcf7-validates-as-required" aria-required="true"></textarea></span></p>

Thanks