w3 Validator errors of wordpress

1). document type does not allow element “style” here

…document.write(‘<style type=”text/css”>.tabber{display:none;}<\/style>’);

2). character “<” is the first character of a delimiter but occurred as data

…type=”text/css”>.tabber{display:none;}<\/style>’);

3). end tag for “style” omitted, but OMITTAG NO was specified

…ber{display:none;}<\/style>’);</script>

<script type=”text/javascript”>document.write(‘<style type=”text/css”>.tabber{display:none;}<\/style>’);</script><link rel=”stylesheet” type=”text/css” media=”screen” href=”https://www.postbloggers.com/wp-content/plugins/tabber-tabs-widget/tabber.css&#8221; /> <style type=”text/css”>.recentcomments a{display:inline !important;padding:0 !important;margin:0 !important;}</style>

all these error are in one line code…
please any one do some help..i feel very thankful for him/her..