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You should specify the same value for the 'lang' and 'xml:lang' attributes. (2:2)
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de">
^
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The 'decoding' attribute is not declared. (45:9)
<p><img decoding="async" src="http://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Firefox3.7a1_acidtest.png/150px-Firefox3.7a1_acidtest.png" alt="Ergebnis des Acid 3-Tests für Firefox 4 in seiner Alpha- und Betaphase: 97 Punkte von 100" /></p>
^
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The 'cols' attribute is invalid. The value '100%' is invalid according to its datatype 'http://www.w3.org/1999/xhtml/datatypes/:Number'. The string '100%' is not a valid Integer value. (127:42)
<p><textarea name="comment" id="comment" cols="100%" rows="10" tabindex="4"></textarea></p>
^
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The 'data-prefix' attribute is not declared. (132:199)
<p style="display: none;"><input type="hidden" id="akismet_comment_nonce" name="akismet_comment_nonce" value="61a82557e2" /></p><p style="display: none !important;" class="akismet-fields-container" data-prefix="ak_"><label>Δ<textarea name="ak_hp_textarea" cols="45" rows="8" maxlength="100"></textarea></label><input type="hidden" id="ak_js_1" name="ak_js" value="211"/><script>document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() );</script></p>
^
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The 'maxlength' attribute is not declared. (132:281)
<p style="display: none;"><input type="hidden" id="akismet_comment_nonce" name="akismet_comment_nonce" value="61a82557e2" /></p><p style="display: none !important;" class="akismet-fields-container" data-prefix="ak_"><label>Δ<textarea name="ak_hp_textarea" cols="45" rows="8" maxlength="100"></textarea></label><input type="hidden" id="ak_js_1" name="ak_js" value="211"/><script>document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() );</script></p>
^
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The required attribute 'type' is missing. (132:377)
<p style="display: none;"><input type="hidden" id="akismet_comment_nonce" name="akismet_comment_nonce" value="61a82557e2" /></p><p style="display: none !important;" class="akismet-fields-container" data-prefix="ak_"><label>Δ<textarea name="ak_hp_textarea" cols="45" rows="8" maxlength="100"></textarea></label><input type="hidden" id="ak_js_1" name="ak_js" value="211"/><script>document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() );</script></p>
^
If you think the validation result is incorrect or if you have difficulties to understand the messages, feel free to