Code Validation and Bugs

Hej,
The code is not valid html5 code. Please fix it in the next release. thanks.

Validation errors:
Error: The font element is obsolete. Use CSS instead.

bugs:
class.mashsharer.php, line 173
<a class="twitter" onclick="javascript:mashTwSharrer(\'' . $url . '\', \'' . esc_html(htmlspecialchars(urlencode($title))) . '\', \'Twitter share popup\', \'https://goo.gl/dS52U\', 520, 350)"" href="javascript:return(0)">Tweet on Twitter</a>
should be
<a class="twitter" onclick="javascript:mashTwSharrer(\'' . $url . '\', \'' . esc_html(htmlspecialchars(urlencode($title))) . '\', \'Twitter share popup\', \'https://goo.gl/dS52U\', 520, 350)" href="javascript:return(0)">Tweet on Twitter</a>
There is a ” which should not be there ??

https://www.ads-software.com/plugins/mashsharer/